Easy, just look in from the drivers side front tire, wipe away the grime, and you can see which one you have.
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There are a few different kinds for the 80's, mine was the non cold weather one. Will be replacing with this very soon.
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Apparently they are pretty easy to rebuild with a starter contact rebuild kit, but I found this new Denso one for the same price as the rebuild parts needed. So I opted for new. I may rebuild the
The Toyota one to keep as a spare.