HL Supply has the 066/660 Meteor piston on sale today for $35.62, good price for a great piston imo. Meteor Stihl 066, MS660 piston kit 54mm
+1 on the meteor pistons Used dozens over the year's great pistons. Never had any problems with their cylinders but others have.
One thing about switching brands on a ported saw you need to check squish they was measured by the piston original to port work
slow but started washing down the boiler today and will finish it up tomorrow then monday we can start cutting out