Can you buy Samco rear springs anymore?

[Longhorn]

I can't seem to find them anywhere. Are they out of business? Is there an alternative, or someone else fabbing up extended length coils?

I finally have all the pieces together to redo my front end:

Cognito UCA's
Extended length Bilstein's 5100's - BE5-6243-H5
Green torsion keys
Rare Parts XD Tie Rods
Ultimate Idler arm by High Roller
Moog Pitman arm
Fabtech steering stabilizer

I need a solution for the rear. Hoping to increase height by ~1.5".

Presently, I am still running air suspension, but I don't expect the compressor to last many more years. As much as I like the air ride, I am leaning toward a spring solution as a final fix. What are my options?

The closest thing I am finding would be factory coils combined with a 1.5" Ready Lift spacer.