If the wheel housings have holes, it is possible to restore them in the conventional way (by welding sheet metal pieces), but it will still show. It's much better to replace the complete sheet metal part to bring your Volkswagen Bus back to new condition. This front wheel housing is such a complete sheet metal part.
You must transfer the original seat rails or, if available for your model and year of manufacture, add them as an extra. Seat rails are listed in the options tab. For models up to and including July 1962, you must also transfer the seat support.
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