Hopefully that picture uploads. This is the cast iron lower bracket that would've probably come on a '66. There are two bolts that attach it to the engine block and one to the head. The annoying part is that two of these bolts are 3/8" while the third is slightly larger at 7/16". Pretty sure the larger one is the forward of the two bolts that go to the block. All are coarse thread and about 1.5" long. The stock ones from the factory had captive washers, so you'll want to throw washers on these if replacing them. I usually use blue loc-tite as well.
The two smaller holes are threaded, maybe 1/4"; these are where the stock ignition coil bracket attaches. (I usually relocate the coil to somewhere on the inner fender to keep it cooler.)
The "ears" on the bottom of the alternator attach to this bracket with a long 3/8" bolt and nut. Bolt is around 4" long.
The upper bracket is a stamped steel piece with a long slot in it for adjustment where it bolts to the alternator. It bolts to the front of the head with another short 3/8" bolt and to the alternator with a smaller bolt of some kind, probably 5/16".
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