Evans Automotive, and if they don't have one I'm pretty sure they can make you one. Because I had them do a turbo upgrade for me a while ago, and I didn't have gaskets, so they had some and made the rest.
They died in 1990 because Lexus was introduced in the end of '89. Lexus has been the #1 most dependable Automobile manufacturer for the last 13 years in a row (with Buick tying them last year). Toyota is ranked #4 most dependable auto manufacturer.
Also Lexus is ranked #1 in Customer Service. I believe you may be able to see all of this stuff from JD Power & Assoiciates.