original type front exhaust pipes for 71 roadie

The leanometer has given me permission to buy new mufflers for my 71 750. I also need new front pipes but I am not sure where to get the original type. [ they angle forward when the leave the head , not like others I have seen that protrude straight out of the head.] I like the way they look. Doesn't matter for the 850 as it doesn't give a dam but my 750 is stubborn and wont accept second best.
regards, Dereck