Threaded expansion plug
 

Honey, I destroyed the threaded expansion plug!!!

Two of the rear expansion (freeze) plugs were seeping and needed to be replaced. One was a standard cup type and was no trouble to replace.

The big trouble is I didn't realize the back one was threaded until I nearly destroyed it getting it out. It was rusted anyway, but now what to do? I don't want to use an aftermarket rubberized plug and I don't really want to put in a block heater (which is what typically goes there, if one is desired).

Living in Phoenix does not require a block heater, especially on a gasser. So, that leaves me with finding a threaded expansion plug.

Any ideas guys? Thanks for your help!!!

Ok, found the parts I need. The threaded plug and o-ring are available only from the dealer.

Part numbers are:

006-997-75-48 - Seal, Ring
117-997-02-30 - Screw Plug

Hope this helps someone else!