Speedometer Cable

Update: I pulled the upper cable from the back of the gage. Measured full length and came to 68" long. Seemed like the lower cable was a little longer than needed. Now, do I go with the 62" length or the 80" length?
Have you searched for a 68 inch cable? 62 might work if the added connectors of a 2 piece cable added a few inches. I'm not sure what you would do with extra length of a 80 inch cable.
MOPAR DODGE PLYMOUTH 68" SPEEDOMETER CABLE with 7/8" NUT AT TRANSMISSION | eBay