The mains things are;

Capacitors:
SNAPIN:4700UF/63V Panasonic (ECES1JU472N) 25.5 X 50 | eBay

Transformer (other places have them too):
Toroidal Transformer 500va 0 50v 0 50v

Rectifier (excessive rating, but means you don't need a heatsink so it's easy):
KBPC5006 Bridge Rectifier 50A 600V

Plus you'll probably want a fuse holder and a switch...