The full Brembo designation for the basic caliper you're after is P2F08. The gold ones were generally known as goldline or goldline racing and are slightly different from the basic black ones. The main difference that I'm aware of is that the goldline calipers don't have the ridges along the top that the plastic covers clip over. Presumably the plastic covers were deemed un-necessary for racing so they were deleted to save weight. They may also have been "shaved" - a bit of material skimmed off the outside to reduce weight.
I suspect the black (road use) and the goldline calipers came out of the same casting mould, but the machined differently during the finishing process. So if you can't find original goldline calipers, I reckon you could modify some standard black ones and get them anodised or powder coated gold.
There was a bit of discussion about these calipers a couple of years ago ...
Who is informed about the different types of the early BREMBO calipers? I'd be interested in the differences between the models F08 and P08. Have both been produced since 1973?
Any information is welcome.