Re: Measurements of a P-90
If it's a limited edition American-made G&L, then you might want to hold on modifying it as it might have some collectible value one day. I think Rio Grande still makes an alnico mag replacement pickup for the large G&L MFD. I think the stock G&L pups sound very good -- a bit like a hi fi P90, so rolling off the treble gets it pretty close. I would think the SD custom shop and others could make a direct retrofit version if you don't care for the Rios.