The "snubber capacitors" would simply be added across each of the recitifier diodes.
.1uF, 100 volt multilayer ceramic capacitors would be a good choice.
Here's an example from eBay----->
(I prefer axial caps for perfboard but you could also go with radial caps)
No, Google plus 4 seconds and he could find his own friggin answer.You know the part about doing in Doing It Yourself. http://www.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=sloa093