I bought mine here;
Chassis mounting toroidal transformers

Two 33v windings in series will give you 66 * 1.414 = 93v DC which is too much.

A 625VA 2x24 would be better, this would give approx 34v dc in parallel, 68v dc in series
Standard Range Toroidal Transformers: CM0625224: 625VA 230v to 2x24v