Nice score. I had one a few years back, only mine was a Wards Squire 6. Same thing, Simplicity built them for Wards and painted them that gold color that Wards used. As for the Hi/Lo hole, from my understanding that fender pan was the same for all tractors made in that lineup. Mine had one thing that was unique, it had a hole in the side of the hood for the pull start cord to come through.
Traded it for some work.
They are neat how the frame flexes in the middle. Takes a bit to get used to at first. Those seat pans are nice too.
Mich60