get the hotcams refill kit not the full kit. the full kit has shims so far out of size for the 250 that you wouldn't be able to use 90% of them so its a waste of money.
don't trust me but i think you want the set closest to 2.8. double check that by looking at stock shim heights. they usually dont get more than .1 or .2 out from stock 3.0 or whatever it is
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