blutch, Ruger makes two different standard GP100 grips, the full size you have, and a "Compact" that was installed on some of the fixed sight guns.
I own one of each, here's some pictures I posted on the Ruger forum that show the difference between the two. I believe that you can buy the compact somewhere, and it's not very expensive (~$20-$30), but can't remember where off the top of my head.
Midway has new factory 1 piece rubber grips for $8.29. They don't have the inserts with them, but you can find those all over the place.
http://www.midwayusa.com/BROWSE/Bro...ring=649***662***12658***8620***&brandId=1366
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