That's cool, thanks. I finally found on Novarossi's site a parts listing for the NS12S3. It lists the 08606 as the correct p/s set for the NS12S3. I couldn't find any info on the RS engines though.

But that just shows the difference in manuals. My manual that came with my engine says the 08604 is correct, but the Nova site says the 08606 is correct.