Jim,
It's hard to see in your picture, but there should be little two "nubs" on inside of the thermo housing where are used to keep the retainer pressed against the thermostate.
This is a picture of my thermostat housing. This is a reproduction housing made of solid brass, but here you can see the "nubs" I am talking about. The original should have something similar, but just pressed in indends in the original stamped metal housing. Hopefully they didnt rust off, or get pressed back out.
My original housing was paper thin from rust, so I had to replace it. Not sure if I still have the original laying around or not. But I will check.
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