looking for a 150 speedo for 67/68 prefer.

Doesn't really make any difference 67-68 both cables are available and not expensive.I do have a 67 w trip meter if that is what you are looking for.

Don't order a cable from Rock Auto because it is way too long. Contact Steve a/k/a 4spdragtop on this site for the details and where he finally found the correct length cable for his dad's car.