Contest of the Gas tanks

I planned to run a Wassell Peanut on the 54, but some time ago I saw this fuckin little sweet Gastank

in the shelf of a friends work shop.

I felt in love with it. 

And it fits the bike as if it was build for it!

Poorly he don´t want to sell the tank and it´s from a very small danish moped company.

So I can´t buy anywhere that fuckin tank....

What do you think? Peanut or Swing tank?