Nope. Points bikes need 2 coils... one per cylinder. When I got my Honda coils from Ebay, I snagged 2 of 'em too. Jus' keep one for a spare.Would the old coil from the on the 80 work for the 75
Since your original SG coil is still good, put it up on Ebay for 10-20 bucks. Some purist might just snag it and give you some of your money back.