What's the difference between a 100 and a 150? Classic Tube lists a set for a shortbed GMC truck that doesn't distinguish between 100, 150, etc. That makes me think that there's no difference in the lines so the Inline Tube set for a '57 1/2 ton longbed will likely work.
Do you have your old lines? Inline Tube will make new ones with your old ones as templates. You can, too.
