Good Luck!! Better buy a lottery ticket first.
I had an SPII for a number of years. Seat had been reupholstered by Corbin before I bought it. I had it re-done by them after seam failure due to age. Pictures of the seat and pan below.
Very odd seat. Hinged on the right side and locked down on the left side. One of my hinge receivers snapped off the frame and I managed to bodge in a reasonable facsimile repair but don't have any pic of that.
Handlebar switchgear is hideous inside. Can't be easily replaced by something better.
Front master cylinder has unobtanium parts worldwide.
16" front wheel is finicky about tire dimensions and air pressure.
Stock sidestand hard to deploy by a two legged human. Not many other options for it.
Patrick Hayes
Fremont CA

