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TR4/4A TR3 or TR4 piston replacement question

TFR

Jedi Trainee
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Moss doesn't offer an 87mm piston for the TR3 or TR4 but has an 86mm plus .040" Isn't an 86mm plus .040" an 87mm piston?
 
One mm = 0.03937"---not quite 0.040". Don't know if that makes a difference.
 
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