45ci changes: air flow fenders, optional chrome muffler, Mellow Tone muffler which was straight - no fishtail, recalibrated carb w/fixed jet, fuel filter w/rubber sleeved gas line, riveted front fender brackets.
Panhead: The primary chain cover on the '48 & '49 had the screws set at 3 and 9 o' clock, while subsequent years are 6 and 12 o'clock. Also, the gear cover screws were changed to phillips. Redesigned cylinder heads w/enlarged cylinder inlet ports equate to 10% more power, valve guides made of bronze, die-cast fork sliders, Mellow-Tone mufflers, (shown on pic below), "Hydra-Glide" name stamped into fork upper front panel, bracket frame bolted to hold oil filter, chrome plated front safety guard optional. The carbs were newly equiped with a fixed jet, limited adjustability of high speed needle and a larger accelerating well. The new carbs were so successful, that HD offered a $5 tradein on older carbs. The oil filter was moved away from the oil tank to isolate it from vibration.

Sidecar and Chassis:
· LE - right hand sidecar
· M - Package Truck w/cover
· MC - chassis for M