73-87 c series coil spring specs needed

[GreaseDog]

looking for the inside and outside diameter of a pair of front coil springs for a 73-87 c10 or c20. does anyone make 2 or 3" coil spacers that will work? not at all concerned about suspension and steering geometry, as this is for my derby trucks.

hopefully someone has a pair of coils laying around that you can measure.

[GreaseDog]

nobody has a pair of coils laying around?

[kemble]

Seems like the cups for 5.5 inch springs worked on the truck springs but I can't remember for 100% sure.

[artv]

I run derby's as well. Replaced my springs with a very HD unit from Rockauto, the only place I could find one. Same overall length and O.D. but very stiff (for a cab/chassis HD). Put me up to the legal height and allowed for a little bounce if I jumped up and down on the bumper. Perfect. O.D. on my old ones are about 5 1/4" to 5 5/16" or so. I.D. is about 3 3/4".