Speedo cable again

[Bobster]

I took my old speedo cable out and measured it @ 61 & 7/8ths. I measured an original cable from a friend's project - cable is 62 & 1/4 in length. My cable pulls free from the speedo gear and quits working. Where can I get a longer cable with keyed drive for trans gear and squared end for speedo? Can't find one from commercial vendors (Snyder's, Bratton's, etc). Thanks, BW