According to the Acura dealership, it's part number 83506-SEC-A02ZB. Cost $35.

I think that's a bit steep for a little plastic part. Any suggestions where I can find this item for less?

 

The p/n for 2004 TSX is 83506-SEC-A01ZB (graphite black) $18.57
The p/n for 2005 TSX is 83506-SEC-A02ZB (graphite black) $19.50

You can get it from Sunnyside Acura http://www.acuraparts247.com

Btw, what's wrong with yours? did you break off a tab or something?

 

That's exactly what I needed. Thanks!

A couple of the tabs broke, either by the speaker install guy, or the dealership fixing my door handle; which disconnected from the locking mechanism. I doubt the dealer will fix it under warranty. They'll blame the speaker install guy.

 

I broke the one of the tabs when doing speakers, easy to do if its your first time taking apart the door. I order a replacement from Sunnyside and had it in about 4 days for about 18 bucks.

 

The key to not breaking those plastic tabs is to warm up the part first, especially during cold weather. I use a hair dryer to heat up the entire area before prying it out; so the tabs are less britttle and reduce the chance of breaking.