Part number for the silver oil sump cover?
 

I was looking around on Jim Ellis Mazda parts and couldn't find the right diagram and part number.

Do you mean the oil pan or the windage tray that goes inside (10-402)?

sorry. I don't know exactly what it would be called. The silver cover on the bottom here. Held on by 7 1/2" bolts.

https://cimg0.ibsrv.net/gimg/www.rx8...8f32f65253.jpg

Part #25

It shows here as part # F18934H80D.

That is the one and expensive..
https://www.parkmazdaoemparts.com/pa...&siteid=215334

It is expensive, but it is a little less so here:

https://www.parts.com/index.cfm?fuse....keywordsearch

If you didn't know about parts.com, hold onto your wallet. They have literally everything.

Ouch that is expensive.

WOW. That price is ridiculous. Guess I'm going without it. I have been for a while and didn't even know it. Anyone make knock offs?

Make me an offer, I have one of an R3 with 9000 miles on it.