hello ,went though parts book and found some data that maybe of interset to people with 22,s
Caterpillar Twenty Two Data

2f 963 last one with square type pre cleaner
2f 964 first with k5 zenith cabbie
2f 1086 temp sender unit moved to front of the head instead of thermostat housing
2f 1350 last one with small cap on starting fuel tank
2f 1351 first with gauges and throttle moved to the front of the fuel tank
2f 1647 last one with ct 4 eisemann magneto
2f 1648 first with cm 4 eisemann magneto
2f 2317 last with vortox air cleaner
2f 2318 first with Donaldson air cleaner
1j 1405 first with splined sprocket instead of keyed
1j 1598 last one with twenty two across the top of radiator
2f model caterpillar along the side of the seat
1j model caterpillar along side of the hood