Turning a 74 into a 72

I'm trying to recall what speedo cable I used with my AutoMeter Phantoms...wanna say it was actually one for a late 60s-early 70s Nova.

I want to say it's a 7/8" end on the trans, and 5/8" on the speedo

EDIT: It's a generic 84" cable...Pioneer part number CA-3004...should be about $12 at a local parts retailer...