
luckily i had a spare bongo front calliper kit in stock.

the seals were exactly the same although the bongo piston is deeper

so anyone looking for an odd front calliper seal etc the suzuki kit is perfect, listed for the gs250,400,450 and others all early 80's.
http://www.ebay.co.uk/itm/Front-Brake-C ... _618wt_906.
they are available cheaper if you shop round, just used this as an eg.