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I converted the florescent tube lighting in my shop to LED. Several fixtures are 8 feet long, and I needed to wire them for 4 foot lamps. I used a vice to bend the sheet metal at the slots; this made a cleaner bend. Two of the fixtures were just slightly narrower than the kit piece when bent on the inner slots. When the retaining screws were tightened, the kit piece was held tightly by the "spring action." The third fixture was narrower than the other two, and tapered towards the top. I bent the inner slots more than 90° toward the center, then bent the outer slots back to fit the profile of the fixture. I was able to slide the kit pieces onto the fixture by taking the end caps off. The design of the kit pieces allows many fixture designs to be accommodated. The sheet metal tombstone mounts have sharp edges. Fixtures may have sharp edges too. In some cases, I used a file to make them safer. Out of the three sets that I purchased, one came with a broken tombstone. I was able to repair it with epoxy. I wish the kits supplied an assortment of clips to mount the bottom covers. I had to fabricate some using heavy wire.
I thought I was buying a complete LED conversion kit for an 8' florescent light fixture. That is not the case. This kit is good as it is to retrofit the fixture so to be ready to accept 4' LED tubes, but does not include them. I should have read the product information better. With the price difference (this kit's price 1/3 of the previous) between this kit and a complete conversion kit (not currently available) that I had purchased almost 2 years ago, I should have looked more closely