The newer Lazer caster wheels have new pre-load set bearings. Are these able to fit existing (pre 2004) caster yokes? How about the new no-Flat combo's? What would be the P/N for these assemblies. I may be looking to get my smooth ride back and go to a regular "air filled" tire in lieu of my Zero-Flats. Would need a full wheel/Tire combo. Any factory feed back on your no-Flat semi Pneumatic casters on the Lazers? Ride? Thanks.