I'm changing the motor in my 1990 SSE. My mechanic only has a limited amount of time and would like to have the new mounts on hand. The problem is there are a lot of different mounts for that model according to my parts guy. Is there a way to tell which mounts to order? Is it listed in the codes located in my trunk?

all the 87-91's have the same mounts one listed as the engine mount front right by ac http://www.rockauto.com/catalog/moreinfo.php?pk=315160&cc=1247318 , the other three as trans mounts- front left http://www.rockauto.com/catalog/moreinfo.php?pk=315149&cc=1247318, rear left http://www.rockauto.com/catalog/moreinfo.php?pk=441131&cc=1247318, rear right http://www.rockauto.com/catalog/moreinfo.php?pk=441120&cc=1247318

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"CERTIFIED BONNIEHOLIC"
B I-1999 Bonneville SE -My First Bonnie- gone forever
B II-2000 Bonneville SSEi (black) 7/3/09 ZZpcm 1.0, Thrasher Cold Air Intake, Magnaflow hi-flow cat, 180 thermostat, Autolite 104's, solid hockey puck front mount, Intense 3.4 MPS. (OCT 2010 COTM Nominee)
B III-1987 Bonneville LE (burgundy) 7/22/10 -- Gone to Heaven
B IV-1991 Bonneville LE (black) 12/6/12 Parts Car -- Gone!
B V-1998 Bonneville SE (green) 9/11/13 -- 270,000+ and going strong! -- gone 287k+
B VI-1989 Bonneville SSE(gray)9/23/15

Big thanks to you Bjkthegame, found them online using info from you