RB20 Piston choice

I have a knackered barrel on the shelf and am looking to steel line it and built a spare motor (or this will probably be the seed to build another bike !)
Looking at piston options am I right in thinking that a Yamaha blaster 200 was the piston used in the kit ?
Cheers Gaz
Looking at piston options am I right in thinking that a Yamaha blaster 200 was the piston used in the kit ?
Cheers Gaz