Does anyone know the bolt pattern for the 01 L, and will the weld XP rims fit?

 

Bolt pattern on all 97 and new F-150 based trucks is 5X135mm Lightnings included. After market wheels can be tricky. Depends on the size and offset (or back spacing). On the rear you need a minimum of a 16" diameter wheel to clear the rear caliper. The offset is 5.5"-5.625".

 

Backspacing is 5.80" on the Lightning. Bolts are 12mm in 1999 and 14mm in 2000 and 2001.