I bought the cheapest one from dashmat.com and it serves its purpose very well. The fit, however, is not very exact but my dashboard was in such bad shape that this still looks much better. The color match is very good, for asthetic reasons I would probably try to find the same material as the carpet in the car. They changed it to velours somewhere in the early 80s.

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'99 S420, 155k
'91 VW Vanagon GL, 150k
'85 VW Vanagon GL, 120k
'82 VW Westy, aircooled, 165k