For all R45/65.
Fits R45 and R65 models with 27hp and valve sizes 34/32mm.
Fits R65 and R65LS models from 09/1980.
Fits R65 and R65LS models up to 09/1980.
For BMW OE piston.
Stainless steel, ONLY for the small Gel battery or Hawker PC680.
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