No, I don't believe you need the LAP bumper to use the LAP airdam. I own both in Carbon Fiber and I can tell you that the airdam will mount to the stock steel bumper of my 72 Super. In fact, I am going to keep the steel bumpers all around and trim them so I can use the carbon fiber ones as caps in order to maintain some sort of protection as well as a mounting point for the airdam.
Beware that it is expensive not just to buy but to ship. Unless you're determined to get the carbon fiber one, look for a used one at a VW show or ebay or the Samba classifides.
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Mike Serrone
'08 GTI DSG :: 1980 911 SC Track Car
1972 1302 German Looker - dearly missed
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