Seat mods for a more comfortable ride?

loganscuda said

View attachment 1715203896 I installed BMW COnvertible seats 2005 has built it shoulder belt. All power Even the headrest is power.

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I just picked up a pair of the same seats from a 2004 E46. How did you mount them to the floor? Did you drill new holes for the BMW sliders, or did you fab brackets to adapt the BMW sliders to the stock mounting locations, or?