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If you have a 1973 Type I (Beetle, Ghia, Thing), someone converted it to F.I. and you just need to get the parts to convert it back, whether a kit or from a boneyard. If you have a Type 4 (411,413) or a 75 and later bus, find a 1972-1974 Bus to steal the parts from. If you have a Type 3 (Squareback, Fastback) you'll need to buy a kit online or from your local VW shop Since by asking the question I assume you are new to VW's, you will be much better off going with a local store than online.