I was looking for this info a while back and found this:
Rear Spacer Tube: 202.8 +/- 0.05 mm, 7.984 +/- 0.002 inch
Front Spacer Tube: 107.9 +/- 0.05mm, 4.248 +/- 0.002 inch
Here:
http://www.badweatherbikers.com/buell/m ... OST1504686Which matches up with some measurements someone took of some new spacers (I can't remember where I found this info):
Rear measured:
O/D = 1.447” = 1 1/2”
Wall thickness = 0.113” = 1/8”
length = 8”
O/D = 36.78mm
Wall thickness = 2.82mm
length = 23mm
Front Measured
O/D = 1.251”
Wall thickness = 0.112”
Length = 4.248”
O/D = 31.79mm
Wall thickness = 2.82mm
length = 107.86mm
Also, the originals are made of aluminium not steel.