they won't light the same if you use the LS1 harness. and the pigtails are different. the connectors do fit if you shove them in as john sed. i say dremel out the holes as he also suggested because the LT1 harness/connectors run push and twist bulbs and the LS1 harness runs the Better spade type push in. and as far as the lighting goes. the LS1 has the amber directional. Lt1 doesn't SOO on the LT1 the whole tail light(red) lights for brake and directional. were as the LS1 just the outer most bulns will light. i think it looks shitty like that. but its not an easy fix.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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