I have repaired several A/c leaks on my 88 300E in the last couple of years and just located another, but it still has the original evaporator with no signs of a leak.

Last year I replaced a leaking TXV, then a leaking condensor. It leaked out again and I thought that surely I couldn't be lucky a third time, but I was. I must be making the MB Gods happy.

This time it is CLEARLY leaking at the connection manifold on the compressor.

I know that the seal in there is two o-rings and I am assuming that they are just standard a/c O-rings. I have a very good Auto AC O-ring assortment at work, so I will bring it home next weekend and see if I have a couple that will fit.

Does anyone know if these are just standard a/c o-rings or is it a special size?

Thanks.