Yep Those are Ricky Racer pipes that Lance Weil had made, and they were SF 750 Ground grinders on right hand corners.
I worked on my SFC 750 in Lances shop in Pomona in 1977 and found Lance to be remarkable prototype guy but some of the parts he reproduced
were slightly not to be race tested. In 1979 I had Steve Carrol who ran European Cycle Specialties X - Ricky racer employee who built my SF750 exhaust 2-1 and my Zeta race 500 2-1 systems and they turned out amazing. But Later Steve Carrol just closed shop and disappeared.
The Pipes I just installed 72 SF are from MALCOM COX from the UK. Just a work of art. He is fast and accurate in the fit up, I only had to make thinner flange collars on my lathe to fit the SF stock flanges due to his headers are slightly larger in diameter than the stock 1972 pipes. Still the pipes now look amazing on my SF750 , The photo included is the SF Engine Stock Flanges with collars from with different diameters on the counterbores for the Laverda flanges before I machined new thinner collars to grip the new pipes from Malcom Cox. sorry it's not in mm for the counter bores.
Wolfgang told me the Stock SF750 center stand will not work with a SFC 750 race pipe copy- 2-1 exhaust on the left side exit. and he was right,
the center stand frame mounts on the SFC 750 race bike were different, slimmer and that's why all the Model SF-750 1,2,3 BIKES had the pipes out the right. for 2-1 aftermarket pipes, Also the left side foot operated side stands got in the way on the stock SF'750's because the foot bar for the side stand and bar on the center stand on the left side to park the bike. But if you got rid of the stock 750 SF 1,2,3 center stand, A good exhaust pipe builder could fit up a left hand 2-1 with 1-1/2 tubing, to a merge collector to the tapered Megaphone with an optional core to calm it down there are companies are all over Southern California for the exit megaphone parts to build this. Believe me I wanted One before I bought one of Malcolms systems.
Jeff Tuttobene