Hi, Mine is a 2003 LS430. I ordered a pair of trunk supports from Lift Supports Depot (www.autopartsbylou.com) for $41 each plus $7.90 shipping. They were shipped promptly. Installed them this a.m. & they seem to work fine. Saved a couple hundred bucks, I think.
Don Bacon
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try this
http://www.autopartsbylou.com/auto-parts-search.php
or
http://www.figsprops.com/oemstrut.htm
both have replacements.
good luck