All right i'm confused.
The downpipe part# is 1234908219 which i ordered the improved ANSA version of which i'm not going to doubt about being correct. Done deal i think. It's their own proprietary part number but whatever, everyone says it's way better than the OEM.

I also ordered 202-492-01-81 to connect the bottom of downpipes to center exhaust pipe...

....But some people show this part as a rubber ring https://www.ecklersmbzparts.com/mercedes-seal-ring-22439.html and some people show it as a substantially chunky metal ring.

This diagram here has no appearances of metal rings, and shows just the one rubber ring at the bottom connection. https://www.ecklersmbzparts.com/diagram/view/index/id/156

But then you discover that there might be a part that connects to the top of the downpipe as well, 107-492-14-09
, which here at pelican you can see looks identical to the one at the bottom of the downpipes https://www.pelicanparts.com/catalog/SuperCat/3306/MBZ_3306_EXHPIP_pg1.htm shows them both next to each other. Clearly pelican thinks there are two rings, and they are both metal.

So, are there rubber rings involved? Or not? And do i need two? And do i actually need two metal rings AND two rubbers rings?? Sigh. Pelican shows no rubber ring at all!! And why are we sharing part numbers ?? Part numbers are not for sharing !!!

What would you guys do?