When I purchased my SC it was lowered 1.5 inches by the previous owner. He also ran over a curb and tore out most of the lower bumper cover. What he didn't tear out, he cut off.
Since I installed the MP spoiler I'm not in a big hurry to find a new (used)bumper cover.
The "tabs" that the two bolts go into fit up into the square holes in the radiator core (or radiator support). I turned the tabs sideways, held them with one hand from behind the radiator core and started the bolt with the other hand. A helper to hold the spoiler will make that job a lot easier.
The slots in the spoiler are made to go around sections of the original lower bumper cover.
The MP spoiler works very well. Before I was running 200 to 210 degrees just driving around and close to 220 when I got on it. Now I run 190 just driving along and 200 when I get on it.
eddie
'90 5-speed SC
'97 LX sport