Dear George, Dave, Bill.
I just received the parts from Freisinger, so the parts exist. I paid 450€ per side ex VAT and shipping. I'd rather use these than machine my calipers.
Are they reproductions, who knows?
They do carry a Porsche number, 911.352.540.00.
Now are these SC/RS parts? I guess not, my mistake. But neither are they one off skunkworks or 'dream' parts...
What I wanted to do is give the OP an answer to his problem, and help fellow Pelicans the way I've been helped countless times by using this forum.
These parts are marketed and known as SC/RS brake parts here in Europe, my guess is these were made around 1978 to homologate the 930 brakes for use on the Group 4 Rallye 911 SC, that came before the SC/RS. I think the misunderstanding comes from the fact that these would be RennSport parts, hence the SC/RS moniker. This is, of course, pure speculation on my part.
