Vespa super with 10" wheel conversion

I have recently purchased a 1966 Vespa super which has been converted to 10" wheels. The stand seems too short can anybody tell me what height the stand should be for this conversion the current one measures just over 10".  Also the chrome air filter cover is rubbing the inner arch of scooter body, does the rear shock absorber need a spacer on if so what length.  Thanks in advance.