Kickdown linkage question #3 w/video

Police car? that was me Here it is and I just grabbed another set up on Face book market place. This 318 4bbl out of a diplomat police car was just on face book for sale. So they are still out there. I paid $100 for everything and it had a fresh trans. The linkage was worth more than I paid for the motor and trans

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I'm modifying my kick down linkage from a 2bbl set up, adding 2 inches to the rod. How far from the back of the slot is the tab for the spring? And where do I find/buy the right spring?

Thanks