Look, there it is

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Looks like you need a lot of other parts too judging by that corrosion

great plains electronics is the best place for the kits, but their kits are out of stock right now. You can usually still find all the items though if you just search for them on the site going by the list in the out of stock kit.

Big Daddy also sells them, but they're a bit more expensive and have a minimum order http://bigdaddy-enterprises.com/repairkits/bally_kits.htm#b-mpu