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TTR50e GYTR 84cc BBK replacement piston?

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Does anyone know of a 47mm diameter piston with 12mm wrist pin that could work in the TTR50 GYTR big bore kit?

 

My 2006 TTR 50E with the full GYTR catalog installed has a blown cylinder and piston from the GYTR big bore kit. The cylinder is just the TTR90 unit and I have a brand new one ready, I just need a 47mm piston but that has the TTR50 12mm wrist pin diameter.  I have a stock crank, Wiseco piston, etc from a TTR90 and none of it crosses over to the TTR50 case, not even just the con rod. 

 

I've found some 48mm stuff, looked at Honda CRF70 pistons, etc., nothing's correct.  

The only options I have at the moment are:

  • chinese GY6 80cc big bore pistons at $16 each (does not scream quality). 
  • consult machine shops about making bushings to fill the space between the TTR90 piston and TTR50 wrist pin. I've read this can be durable, but I fear it will be expensive.
  • contact piston companies for custom units, which will inevitably require a bulk buy

Any help would be greatly appreciated!

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