Hud

I have not been able to find a complete listing of crush washers needed for my RDX.
I need sizes for:

Oil plug
Transmission Drain and Fill plugs
Rear Axle Drain and Fill plugs
Transfer Case Drain and Fill plugs

Last rear axle change I asked the dealer, he sold me 2, one was too large and both were about $3 each. If he wasn't 25 miles away I would have returned them.
Thanks for your help.

Ratical

https://www.acuraoemparts.com/auto-parts/2016/acura/rdx-5-door/tech-awd-trim/6-speed-automatic-engine/chassis-cat/rear-differential-mount-scat

It takes some digging but any online Acura oem parts dealers should have a breakdown and part number for what you need.

Crashmaster

If you are going to be doing all these fluid replacements yourself, I would suggest you go with magnetic drain plugs such as the Gold Plug. You can purchase a Gold Plug for each component and also get replacement washers at the same time.

joeshmoe

The oil drain plug was 20mm and the differential was 18mm. Those are the only ones I've change so far. Got both on amazon in a bag of 10 or so for $5-6 or close to that.