At less than half the price from Sig and the same cost with shipping as the ones on eBay, I should be suspicious and require hand-holding by an Authorized Sig Dealer since my own experience is deemed inadequate to determine the optimal requirements of a Porsche oil-change - in any language.
But this is the second data-point I've gotten for the following information as opposed to one single experience, weighted by opinion:
These grips will not fit properly if you have the old style metal mainspring seat. Will fit P220's with the new style black plastic mainspring seat.And I've got a 20-year old Sig/Porsche - time wounds endlessly, and so too the viper tongue of youth - and it inflicts engineering changes besides. However since I'm a highly skkilleted professional despite having not even Uno job, let alone Zwei, I believe there is a way to deal with the too-long screws and the 0.055" offset.
In the first case the thickness can be reduced by half - that's your 0.055" there.

In the second you can see in my old grips what appears to be a toothed or serrated lock-washer (epoxy actually, nonm-removable). They/it occupies a portion of the depth-cut for the screw-heads, since you don't want the heads seated below flush anyhow because then they become crud-collectors, and prevents the screws from seating too deeply, as in the deep-cut holes of the "slim grips." (bottom pic)I believe this would allow the backside of the grips to form together in a seamless joint. It's the mainspring seat at the bottom that pushes the panels apart. Forcing them together only produces the wedgie-joint.

The problem remains that the grip is the primary and first interface with the gun, and its integrity should not be compromised - which might happen here, but since I have already begun to saw away at the tensile fabric of the grip and cannot return them, I might as well carry on...






















