Can't offer advice about Lemans specifics but V7 Sport foot pegs mount upon each end of on a separate bracket, not on the lower rails. I'm not tall or big belly (5-9+, 36 waist) but I don't like to ride on the front pegs with the plain tommaselli clip-ons. Too cramped. Very cramped if you're riding 2-up. Probably OK with upright bars or original swan necks in upright position. Rear pegs are more comfortable. Making a bracket for rear sets & controls located about 2/3 between stock front and rear peg location, just below the rear attachment bolt, would probably be ideal for me. Thought about doing it for years. Just haven't done it yet.
If you went that way, you could make the footpeg bracket fit your preferred position. But I wouldn't expect finding original V7 Sport or LeMans lower rails would be a budget-minded or simple task.