PLM Bottom Mount Adapter Plate For Low Down Rails Description These adapter plates converts our low down rails so that it is compatible with bottom mounted seats. PLM Bottom Mount Adapter Plate For Low Down Rails are designed to convert the side-mounted rails to your bottom-mounted seats by attaching the adapter plate with 8 simple nuts. They are made from high strength steel making the rails stronger and more durable. The brackets will not bend or warp with heat whereas other brackets can be bent easily by hand. PLM Private Label Mfg. seat brackets are more versatile with pre-drilled slots for seats from most major aftermarket seat manufacturers like Sparco, Recaro, OMP, Cobra, F1Spec, Racetech, Status, Corbeau, Bride, MemoryFab, Momo, etc. There is also extra material for direct mounting when the driver wishes to eliminate sliders altogether. Comes in a set for (1) SINGLE SEAT. Pre-drilled dimensions are the following: FRONT TO BACK 10 1/2", 10 3/4", 11 1/2", 12", 12 1/4", 12 3/4", &13" LEFT TO RIGHT ( SLOTTED) Ranges from 10 1/8” – 14 ¼” Bars can still be drilled to fit other seats.