they list those same part numbers for all w-bodies, and i know there were a bunch of different wheel sizes and trim levels, they dont all use the same, so i doubt they actually made sure it would work for each application. ive never even heard of them before.
personally i would just grind down the lip were its hitting the tire but there is some danger in if you dont know what you are doing you could ruin the integrity of the coil seat. if you arent comfortable with doing that i would take it in to somebody. if you put spacers in it you will have to mess with them for the rest of the time you have the car and there are possible issues with hub wear ( w-body hubs already suck) and possibly issues with fender clearance
1998 Bonneville SSE
2007 Monte Carlo LT-KYB, Clarion, Polk audio, Kicker
1999 Yukon SLE-KYB, Air lift, Reese dual-cam, Tekonsha
1987 Firebird-355/th400-nothing stock