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New tank emblem is round Lucite disc, with 2 red and 2 silver quadrants with red "Harley Davidson" name. This and the new front fender tip was HD's first use of plastic for emblems.
Panhead changes: Steel alloy valve guides -(starting February 1st), instead of bronze exhaust. The exhaust guides were threaded to trap oil. Polished aluminum rocker covers, shorter pushrods w/longer adjusters, thinner speedo cable. The "Big Bertha" saddlebags were optional for 1957 only. Starting with 57FLH4444 stronger valve springs were used.

Flathead, 45", 3 speed and reverse
G, tow bar
GA, without tow bar
Panhead, Hydra-Glide, 74", 4 speed
FL Sport Solo
FLF Sport Solo, foot-shift
FLH Super Sport Solo
FLHF Super Sport Solo, foot-shift

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

1957 Panhead colors
Pepper Red with Black tank panels and Pepper Red fenders
Black with Pepper Red tank panels and Black fenders
Skyline Blue with Birch White tank panels and Blue fenders
Birch White with Black tank panels and Birch White fenders
Police Silver
Metallic Midnight Blue (and fenders), with Birch White tank panels
No extra cost: Birch white, solid or black panels and matching fenders, Metallic Midnight Blue (and fenders), with Birch White tank panels.
1957 Servicar colors
Pepper Red
Skyline Blue
Police Silver
Metallic Midnight Blue
At extra cost: Metallic Midnight Blue.
the Flathead Register for 1957:
the Panhead Register for 1957:
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