Too late now I suppose, but I had a new top installed 4 yrs ago on my 98 Boxster. I replaced my old plastic window top with the newer rear glass version. The whole job (material and labor) was $1,200.
I assume the OP obtained quotes from their area installers before buying a used top and starting the DIY job. Certainly "braver" than me!
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98' Boxster
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