Help ID this set of pedals if they are from Slant, 318 or HD style like 340 and BB darts

I believe those are standard duty pedals, from how the spring mounts on the side. Also, the spring itself is not as beefy as the HD unit.

The HD assembly has a caged spring that mounts on a pin at the front. You can see in the pic below where the spring goes, but the spring isn't in there. You can also see the HD spring sitting on the table next to the assembly.

You can also tell by the over sized bushings in the pivot, but you'd need to disassemble it to find out.

Ultimately, you will probably not even need the spring anyway. The new diaphragm clutches require you to remove the over center spring.

Screenshot_20220630-212737.png