The one that I linked to is:
Board dimensions 3 5/8" x 1 5/8" with the heatsinks extending 1" above the board. Too big?
I did as Crimson suggested when I soldered mine together except I soldered a 3 way screw type terminal block where the pot is supposed to go.
http://www.mouser.com/catalog/629/1244.pdf
As far as knobs go, what are you looking for? I've got some new smallish ones from another project that look like silver stereo knobs. BTW, it doesn't come with a knob.
Mouser's got a ton of knobs of all shapes and sizes
http://www.mouser.com/catalog/629/1502.pdf