Help needed

[netman]

I am hoping one of you know the part number for the seal that goes into the final drive of a 1978 eldorado where the axle extension goes into the final drive.  I have tried the one listed in some recent parts manuals and its metal ring diameter is too small. also the rubber seal part is too tight.  I have attached a diagram from the 1960s models to show the seal i am searching for.  Please see the seal below the arrow

[The Tassie Devil(le)]

This seal is a special one as if you look closely at it, there is a small vent hole in the top, and this seal must be installed with the hole at the top.

Should ve available at a bearing supplier, and if you can get one to match the inner and outer measurements, you might have to simply drill a correct sized hole before installing it.

Bruce.