Holy shit that is horrible. It's a rear upper control arm, do some ebay searching, or call Steve Miller at Miller Imports on the east coast.

Holy cow thats corroded! How did you not spot this sooner and fix it before it came a hazard?

If you need arms i have some oem arms and im in europe. If i can help pm me as its closer then the USA. Just depends if shipping is a problem currently due to the issues worldwide

If you ever plan on adjusting camber just buy the FIBA UK adjustable rear a-arms.

Honestly, I have no idea how I didn't spot it while changing wheels.
Wasn't that long ago I had it on EU-Control either so I'm surprised they didn't notice or say anything about it.

Got prices on 150 euro at the cheapest for each one. So 300 euro for rear arms.
Any idea if that's expensive compared to other places?

Still looking for a site that sells upper control arms for the rear, would love some links if anyone know about any site(s)

Nickolay said:

Still looking for a site that sells upper control arms for the rear, would love some links if anyone know about any site(s)

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Found some Moog replacements on RockAuto for a 96 Eclipse N/T:
http://www.rockauto.com/?a=dsmtuners

Search for this:
MOOG RK640826
MOOG RK640825

I replaced all four upper control arms, got them all from Rock Auto. They fit perfect and were simple to replace provided you have the basic tools you need. Looks like you might need a new knuckle bushing and bolt as well it looks pretty rotted and corroded.