Top quality seals kit from SIP Vespa 150 super, T5, early and EFL PX - please check the sizes you require before buying, it is usually the rear hub seal that is different.
 
  These are all produced by CORTECO. The blue type are a little tougher than the black type which can be found in most engines as an original PIAGGIO component. The brown seals are produced using a fluoro polymer material (FPM), are especially heat resistant (up to 160° and are harder wearing with more resistance against oil. Both types see wide spread use in all two-stroke motors. 
 
Fly seal, blue - 24 x 35 x 6
Metal drive seal, brown - 31 x 62 x 4.3 x 5.8
Rear hub seal, black - 37 x 47 x 6 mm
 
It is recommended you use loctite on the drive seal to secure it in the casing.