Shim UNDER tappets spotted here:
http://cgi.ebay.com/ebaymotors/Parts-Accessories_Motorcycle-Parts-Accessories__GS500-GS-500-GS1000-GS850-GS750-Shim-Under-Tappets_W0QQitemZ330274249676QQddnZPartsQ20Q26Q20AccessoriesQQadnZMotorcycleQ20PartsQ20Q26Q20AccessoriesQQddiZ2811QQadiZ2863QQcmdZViewItem?hash=item330274249676&_trkparms=72%3A543%7C39%3A1%7C65%3A12%7C240%3A1318&_trksid=p4506.c0.m245 (http://cgi.ebay.com/ebaymotors/Parts-Accessories_Motorcycle-Parts-Accessories__GS500-GS-500-GS1000-GS850-GS750-Shim-Under-Tappets_W0QQitemZ330274249676QQddnZPartsQ20Q26Q20AccessoriesQQadnZMotorcycleQ20PartsQ20Q26Q20AccessoriesQQddiZ2811QQadiZ2863QQcmdZViewItem?hash=item330274249676&_trkparms=72%3A543%7C39%3A1%7C65%3A12%7C240%3A1318&_trksid=p4506.c0.m245)