Chainsaw Repair

Do these have serial numbers on them?

Not to my knowledge.  I think that they were trying to 're-work' the inventory that they had in-stock, and just screwed up by sending me a replacement that had not been checked.  Poor QC/QA.

It's pretty easy to check by mounting both wheels on the arbor to see if they fit, and by seeing how much clearance there is between the motor housing and the chain positioning stop. Most people will probably not use the optional 1/4" depth gauge wheel, but you can mount the 3/16" wheel and add a washer or piece of heavy cardboard to see if a 1/4" wheel would fit on the arbor threads.

Philbert