I keep the mounts in stock and the pads can be had from the above specified vendors.
Moroso 62500 - Zinc Plated - $29.99 pair
Moroso 62560 - Chrome Plated - $39.99 pair
Both of these are SBC .250" mounts with a 1-11/16" height (A) and 2-1/2" length (B). A measures height of frame pad ear (from base of pad to the center of the through-bolt hole), and B measures the width of the pad from ear to ear.
FWIW, the use of solid mounts doesn't provide any additional harshness to the idle or ride. It only adds to the rigidity of the truck and increased longevity of part known to commonly fail. Basically, no side effects, and you never have to worry about it again.
HTHs
Hood