They work, but expect additional holster wear on the lower where the lower and upper meet. The width of the SP-01 dust cover is 1" exactly, and the width of the P-01 dust cover is 1 1/10". That extra 1/10" makes the holster fit snugly, it wears at the front corners and along the dust cover, and doesn't positively engage the trigger guard like the holster should do.