I found
oil in mine also. Thought it was a leaking strut. Turns out they pore
oil in the strut housing about 1/3rd up cartridge for heat transfer. Yes, old site had info on replacement part numbers. My replacement cartridge I got from bdr was different than the factory cartridge. But it came with a spacer that took up any size difference issues. I am on travel. When I get home I will see if I wrote down the pn.