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Wiring classic Shure 545 unidyne iii 4 pin amphenol to XLR

Can anybody help me with the correct cable wiring for a Shure 545 which has 4 pin amphenol connector (the type which changes impedance by changing the mic cable) very early I believe made in USA before Shure moved production to Mexico.
I bought 2 of these for my son but need to try to sort cables for him

Shure 545SD Unidyne III vs SM57. What's the difference?

So; I was talking with a friend of mine and we both professed our ignorance regarding the difference between these two mikes. Does one have a transformer and not the other? Aren't the capsules essentially the same? Was the SM57 simply an upgrade on cosmetics?

It would be interesting if anyone had some insight on this. at least to me, anyways!