1976 k-10 stepside

[us111]

HELLO,,new here,,nice site looks like..I have this 76 i been working on,has a 5.7 out of a 1999 cadillac escalade in it..PROBLEM is i know absolutely nothing about suspension.DRIVER side rear leaf main bottom leaf is broke and has to be replaced.THE problem is the front mount for both side leaf springs are in bad shape.I have looked every where for new ones,no luck..IS there a better way to go,,somplace to find them,??? THIS motor has a lot of torque so i really want to go the best way..THANKS for any help....