I recently bought a 47 2n parts tractor for my 44 restoration.The seat on the parts tractor has a coil spring and shock absorber style that is much nicer than my 44 seat. I would rather use this seat but I'm not sure when or why Ford began using them. Also the rear wheels are much different. the 47 wheels are more similar to International style wheels.They seem lighter and there is a gap between the center section and the rim versus the ones on my 44 which seem heavier,also 2 piece but with no gap.I cant find any info about these particular item styles. I also know sometimes on the assembly line things were changed just because of availability at a particular moment. Any help would be appreciated as I'm trying to be as period correct as possible.