Vespa PX and Smallframe dimensions????

[Bones]

Just built an engine building cradle to fit a PX engine in and now need to make up some adapter plates so a Smallframe engine can be built in it.

The PX engine mount is 21cm wide.................How wide is a Smallie one?
The distance from engine mount to rear shocker mount is 37cm................What is the distance on a Smallie engine?

Thanks for the help!