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Piaggio Sfera, Typhoon, Zip, Zip SP, Skipper, Hexagon and Vespa ET2 & ET4 Service & Repair Manual: 1991-1997 (Haynes Service & Repair Manuals): Coombs, Matthew: 9781859604922: Amazon.com: Books
Piaggio: 1991-2003 Vespa: 1996-2003 Service and Repair Manual (Haynes Service & Repair Manuals): Mather, Matthew and Coombs, Phil: 0038345034923: Amazon.com: Books
1991 PIAGGIO VESPA 50 REVIVAL
VESPA PK XL HP 1991-1991 PIAGGIO ORIGINAL SPEEDOMETER PINION GUIDE | eBay