rear suspension question

[fredico]

I have a '71 K5 that needed rear wheel cylinders. when I went to change the left rear cylinder lo and behold the spring retainer plate was in three pieces. So I need to replace the left rear spring retainer plate. It is the plate that the U bolts pass through to hold the springs to the axle. Never had one break. I have not been able to find one. I checked parts houses even one's not dedicated to chevy's and blazers with no result. HELP!!!!