I need a motor bracket for blower on a 1959 GM Delco Heat Conditionair where can I find one.

WOW most if not all of that stuff has hit the scrap yard. Looks like you will have to make one.

You can buy a new 8100 1/3HP ODP CRADLE MOTOR from MSC to replace the dead one (1/4 HP). This one has similar structure as the old one.