RM 370 .100-2.5mm can it be done

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I think you get what I'm trying to do. Is there any piston that is .100 or 2.5mm over that will work in my RM370. If I bore it out this far. An older LT500 maybe so far its the only thing I can find that they made in this size. However I dont no if it will work. I also fond some that are 3.0mm but I dont no if I can even bore it out that far and if I do will they even work. Hmmmmmm frustrating!!! There has to be something that will get the job done. Any help would be nice