Ok so as many people that try to say that the Spoon Monoblock Calipers work on any car I am beginning to disagree. Yes you can mount bout the calipers on basically any Honda as Honda has not changed there mounting method of calipers. However the issue comes about the way the pistons are positioned because the calipers use one small piston and one large piston to keep even pad wear.

I made a diagram to help you understand what I am saying about these calipers.




When wheel rotates and the car is driving forward the first piston compressing should be the small piston and the larger piston is the second one in the rotational circle. Thus why there is a specific part nubmer MBR for the S2000 and RSX cause they are rear mount systems and the tsx, ep3, and fd2 are front mount systems. So the large piston is always by the fluid connection tube on the frount mount calipers and the smaller piston is by the bleeder valve. However on rear mount clalipers this would be the opposite and the smaller piston would be at the bottom by the connection tube and the larger would be at the top by the bleeder valve so as to follow the rotatinal directoin.

This is because the greater force would be needed to compress the 2nd half the the pad that the first pard of the pad to give even pad wear.

What led me to this conclusion and information was this thread in which a DC2 owner mounted a S2000 caliper on his front mount DC2. Thus he had to mount the caliper upside down to get it to be functioning correctly. He posted tech diagrams of the actual calipers in which you can see that one piston is bigger than the other. (Here are the diagrams from the thread)







The Thread
How To: Install Spoon Monoblock Caliper DC2 -

In comparison to my original calipers bellow which had an invoice with no part number but stated they were for the euro R and follow the information I have gotten from that other thread in regards to which piston is first.



I would have never figured this out had there not been a 8th gen civic owner trying to figure out if the caliper set I was selling would work on his car. There is a thread on the 8th gen civic forum telling people that the car needs the MBR version to work however as you can see this information found here is incorrect based on my understanding of how this works. Spoon Monoblcok Caliper Review - 8th Generation Honda Civic Forum

I am open to anyone's insight as to whether they believe I am correct or not as what has gotten me even more interested in this information is the fact that I was never given a part number from AJ-Racing when I ordered my original set but they indeed are the correct design as follows. However the replacement set they sent my shop which they said they had in stock and was the same as what they sent me before has the part number MBR which means it would be reverse mount. Tomorrow we will be removing the pads to see if the wrong part number was used or or whether they indeed sent the wrong calipers but either way I believe the information above is correct in telling the two calipers apart and why each has a different part number finally. Thus making it import that you know which part nubmer you are getting when buying a set and not letting someone tell you the other set is fine.

Another way this can possibly be solved is to just move the hardware to the opposite end. Just switch the connection tube with the bleeder valves and there shouldn't be an issue then as well. However I have no guarantee on this either.

I do want to mention again though that the brackets themselves are all the same.

 

I believe I have found the final bit of clerifying information on this. I am pretty sure the Spoon Monoblock Calipers are Differential Calipers and here is the definition of them from this site Howstuffworks "How Brake Calipers Work"

Differential bore calipers -- As the surface of the rotor heats up, the clamping force of the pistons has to be increased to avoid brake fade. If the caliper has multiple pistons (or multiple pairs of pistons), the brake rotor surface is initially heated by the pistons pushing against the brake pad at the leading edge of the caliper, making the rotor surface hotter when it rotates back to the pistons closer to the trailing edge of the caliper. Therefore it helps if the pistons closer to the rear edge of the caliper are larger. Differential-bore calipers use smaller pistons up front, larger pistons toward the back.

 

sounds like you're correct