Old online Chevy manuals has many springs listed in section 4.597. The ones you need are: p/n 3695565, locking, 13/16 ID x 1 1/8 long. and p/n 3687152, anti-rattle, 9/16 OD, 4 coils. I measured the ones on my 49 3100 and those are approximately the sizes of my springs. Hope this helps. The Old online Chevy Manuals website has a wealth of information!
