Need SL-6 Heat Riser Spring Replacement

Not mine but here’s what I found. Searched for Mopar Slant 6. Not sure it’s what you’re looking for.

NOS MOPAR HEAT RISER CONTROL 70 71 72 73 74 | eBay

Mopar NOS Manifold Heat Control Valve Pkg. 70-76 Cars & Trucks w/198 & 225Eng. | eBay