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!!!

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1992 300CE - 157kMi (my white beauty)
1992 300CE - 220kMi (sold)
1990 300E - 189kMi (sold)
1990 300SL - 102kMi (salvaged parts available)
1986 300E - 230kMi (salvaged parts available)

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