stock spring specs Help please

[C10Glenn]

with my truck now in super capable hands I've been asked the question of what the standard spring spec/size/weight rating is for both front and back.

I've checked on the usual sites but can't seem to find the info - to add logic to this my mechanic is aiming to have the springs made locally, slightly lowered but to meet the same (or better) standard specs.

Hopefully I can get some urgent help

Thanks

Glenn