I removed an original clamp that mounts to the gearbox this weekend from a '70 Nova, exactly the same thing as in Steve's photos.
The Phosphate coating was well-preserved due to this car being an oil leaker since day one.
No vendor stamp anywhere, but it is phosphate plated dark gray. This car was 100% bone-stock V8 4-door.
No evidence of any spring clamp or similar retainer holding the hoses together.
The return line had the sleeve around it, roughly 8 inches long, which strongly resembles Steve's, looks identical to the rubber copper pipe protector/insulation that you see at Home Depot (I have never seen the other protective sleeve as on Steve's pressure line, and I have stripped many of these and other similar GM cars over the past 30 years), but maybe his is original. If not, it sure looks like a smart idea in the interest of protection.