Need Alternator/Alternator Bracket for "66 225 Slant 6

Guessing you "need" a different bracket because the A100 mounts the alternator on the manifold side of the block while the passenger cars had it over on the distributor side, so your alternator hookup wires are in the wrong place for the alternator in the A100 location. If you don't have power steering or A/C you can leave the alternator in the manifold-side location and simply reroute the alternator hookup wires (do this thoughtfully from the firewall directly; make them shorter and not longer). If you do have P/S or A/C, you will need the lower alternator bracket as well as the upper one shown by 48Limo. Get them from any year slant-6 that has the alternator on the distributor side. As for an alternator, go get a new one (not "remanufactured" garbage) from Old Car Parts Northwest. 46A max unless you are upgrading the charging system as described here.