As I try to put my 68 Coupe back to original-ish I have a question:

Were the factory heater hoses the "ribbed" version or the version with "GM" stampings on them?

Thanks!

They were both. Larger hose is Ribbed with GM logos.
Smaller one is just Ribbed.

Note that the repops are similar, but not correct. I just checked the ones on my ca,r which are repops, and they have raised ribs. If I remember correctly, the originals have grooves. Not sure how many grooves, but the repops have 5-6 ribs.

The good repops have grooves not ribs...

Is this the same for '67, and who makes the correct repops? The ones I find either have ribs/grooves or GM, but not one with GM and one with ribs/grooves.