Kick down linkage return spring needed

Hello,
I've searched the web to purchase 1970 Dodge Challenger 727 automatic transmission kick down linkage return spring and see that there are a lot of choices. There's been discussion on what color springs to use as well. Everything from white to red to green and even unpainted steel. I'm running a small block with a four barrel carburetor and a mechanical transmission kick down linkage. I'm looking for vendors to order from.

Thanks for your help,

Tirekickertoo