I hear you though. Any time we unpack new/rebuilt equipment at work, I snag the fender washers, etc. before they get tossed out. They've come in handy so many times.
If it applies there's a wheel conversion kit on Amazon get rid of the spacers the shims Etc in a converted over to Roller bearings complete set for two wheels is about $15 there's also another thing to watch and both of these poor mana power steering if it applies I'm referring to the Tractor I did which is a Husqvarna GTH2248XPC and the spindles were three quarters of an inch everything slides right on and it makes it much better check it out
On a grander note, I always save and harvest fasteners thrown out at work. I've got buckets of washers, nuts, bolts, machine screws, wood screws and nails. I rarely have to make a trip to the store for hardware.