That's a great little set! It does not follow the typical hardware placements as a standard catalog jazzette would but I have seen another with the mounts and placement of the rail like yours. Basically all your components are the same as a downbeat set and placed in the same spots. I have a 1972 jazzette in silver sparkle and it has the usual factory spurs and rail mounted at the top. I would clean those up as best as I could, add a correct silver sparkle hoop to replace the mis-matched one and play the heck out of them. They are definately cool and very collectable. It's too bad about the extra holes but it should still be worth a decent amount. Besides you picked them up for a steal!
Here is mine....