1958 brought a big change to the panhead models. starting in 1958 until 1964 they would be designated duo-glide.in reference to the newly designed step down straight leg swing arm frame with rear shock asorbers. this also involved changes to the horseshoe oil tank and many frame and rear fender changes to accomadate the mounting of fear shocks.
other changes include hydraulically actuated rear brake light switch, a two unit voltage regulator,cast aluminum intake manifold,
thicker cylinder head fins and a tear drop tool box.
optional dual exhaust system available.

 

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 Here are some great sources for detailed information about Harley Davidson’s 1958 Panhead

How to restore your Harley-Davidson by Bruce Palmer 111

Riding vintage website

the Jocky Journal web forum

hydra-glide.com The panhead and flathead site

The Harley Davidson Panhead service manual 58-59

1958 models

model	engine type	actual displacement	compression	options
FL sport solo	74 c.i.high compression	73.66 c.i.	7.25:1	—
FLF sport solo footshift	74 c.i.high compression	73.66 c.i.	7.25:1	F=foot shift
FLH super sport solo	74 c.i.high compression	73.66 c.i.	8.0:1	—
FLHF super sport solo foot shift	74 c.i.high compression	73.66 c.i.	8.0:1	F=foot shift

NOTE: the ” F “ denoting foot shift will not be stamped in serial number.

1958 models available colors

paint	stripes	speedometer
*black	—	Warner speedo with italic “Day-Glo” green numbers and hash marks with gold painted center
*calypso red	—
*skyline blue	—
*sabre grey metallic	—
*birch white	—
P police white	—
P police silver	—
*calypso red /birch whiter	—
*black/birch white	—
*skyline blue/birch white	—
*sabre grey metallic/birch white	—

*Two-tone is standard in 1958, 1st color is tank top and fender sides, 2nd color is tank bottom and fender top.
No extra cost: any solid standard color

* standard solid color could be ordered at no extra charge.

P =police only

black

calypso red

skyline blue

sabre grey metallic

police silver

birch white