Help ID 273-4 valve covers

Looks like in my pic, the filler cap and PCV cap have been swapped on the left hand set of covers.

I assume the wire harness holder goes on the pass side for the harness that goes to the alternator.

There is a possibility that the right hand set in the OP has the pass side cover replaced with a non-HP cover, as at least one set of fins is glued on with silicone.
if you look at the pic, you can see it's also slightly lighter and dirtier.

So, double stove pipes and wire management is 66 for sure?

I'm not seeing a difference in large vs small wire management.
Is it for the plug wires or the alt harness?

Are those plastic plug wire holders the same as non-HP cars?
Are they available?

Thanks again. I had no idea this would explode like it has.