Transmission rebuild or replacement costs? on 2001 Porsche Boxster

Took my 2001 Boxster to get a leaky trans seal the dealer is saying bushings inside are damaged and wants another 2900.00 on top of the original 1800.00 (to put in a used transmission!) It was running fine, just leaked before I took it in??? Says Porsche doesn't MAKE parts to rebuild them?

I'd say look for an independent Porsche specialist. You may find a clever guy who can fix it.
Here's a directory link for you:
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I really dont believe that because if that was the case why do they sell rebuilt tranmissions for them an believe it or not im having the same problem outta my porsche boxster....