O-ring part#...........

[1987 GN]

I am looking for the o-ring that goes in between the oil cooler and the block for a TTA. It is discontinued from GM and the local parts stores cannot cross-reference it with the GM part # and they do not have a part listed for this application either. I posted this on turbobuick.com as well and I have received a lot of feedback I was just wondering if anyone knew of an exact replacement that could be used. Someone mentioned just going to PEPBoys and looking through their o-ring selection until one fit but if someone knew the part# off hand that would be greatly appreciated so I could just go and ask for the right part the first time! Thanks again. Rich.