Hi Aero, there is lots of help here for that conversion. It's not hard, just need some patience. Can you post some pictures of the inside of the bumpers so we can direct you to the best way to fabricate the mounts. There are some good adaptors available from one of the members that are very reasonably priced and they come with instructions. Rear is easy if you use the standard mounting process but there are holes to fill from the original mounting (74) pieces. I had the 74 boards on when I bought the car and the look with the earlier style is much better.
Cheers