I found springs at Eagle hardware (which has been acquired by Lowe's) that worked for my B. You might check Lowe's or a well-stocked hardware store.
I cut a strip of rubber from a chunk of radiator hose to use under my radiator, seems to work good though it was a bit thicker than the pad I took out.
That B sure is looking pretty. Bet you can't wait to get it fired up again.