So i bought some OMP ASR bucket seats to replace the 323gtr ones in hope of a tighter and lower seating position...only problem is i tried my best to get the original floor gliders in place (since i want to be able to move back and forth. Even tho i drilled the new seat brackets to get the mounting point as low as possible, im still to high up and the offset original mounting spots are a real pain in the ass to allign
Anyone got some tips on premade seat mounts for racing seats with gliders, or is it swearing time and breaking out the welder ?

I have same problem mate, I fitted a Recaro Ergomed some years ago and I built my own mounting rails out of 25mm box and bar, no welding in my case. Mine's mounted as low as it will go but it still sits a little too high!!

Unless the seat manufacturer makes specific adapters I'm afraid you're only choices are modifying a universal set or building your own.