Pvs RMX250
I have a 1999 Australian spec RMX. The PV broke at the end of 2000. and when I stripped it down for a freshen up over the christmas break, the replacement pv also shows signs of cracking in the same place. The first one broke one of the arms that push/pull it into the port. luckily it wedged on the port and didn't drop in or contact the piston. The other thing to watch is the pins in the middle part pound into the top guide and over time works further into the cylinder.
about 0.7mm on the newer PV. The last one I bought was $240nzd the latest price is $490nzd. sorry not much help but a heads up for things to watch.