If you decide to go the new parts route on these give Sunset Porsche a try. I got both these items there and they had some decent prices. The spin locks are a bit of a rip off but you need them to use the top so they got you.
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03 Carrera
02 Boxster S Guards Red, black interior with matching hardtop
89 Carrera 4
89 944 S2
78 911SC
I got mine from them last year this way (paid $30). Every once in a while you'll see a set of these brackets that still have the spinlocks and bolts in them. Cheapest way I know of to get a set... I threw the brackets away after pulling the spinlocks.
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2001 Boxster S - Speed Yellow, Black Leather, Tiptronic, Jake Raby rebuilt 3.2 with IMS Solution