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I said talk, not do ;)
Have a few stories of enlarging the ports for moar power and destroying cylinders.
Would getting bits from the EU be any cheaper?
Orings are orings, as long as you have the right material then diameter and size. You can shorten bigger o rings to size.
Thought most bearings in two strokes are usually standard iso sizes. Or just wander to the machine shop and they have the parts. Different country I suppose and 2 stroke bikes are far more common.
Could always just assemble it yourself. Get the bearings and seals from a bearing supplier.
Now let's talk about enlarging the transfers for more power