If you have purchased an aftermarket LO MOUNT BASE for your National seat, this is the correct adaptor.
Patented seat base adaptors are the solution for addedf leg room and adapting aftermarket or OEM seats without drilling holes in your floor. Each adaptor is manufactured to match your specific brand of seat, making installation simple. Adaptors come with all mounting hardware included. Fits Peterbilt 379, 386 & 389. Finish options include: BILLET ALUMINUM, CHROME PLATED, or powder coat colors: GLOSS BLACK, RED BARON, CRYSTAL WHITE, POST OFFICE BLUE & YELLOW.
