Spotted this listed in a line of replacement fork tubes through Race Tech. If anyone researches them please post comments here.
http://www.racetech.com/TNKProductSearch/MOTO%20PENTON/Moto%20Penton/1972
Dale Fisher
Penton Owners Group - Memberships
Facebook - Cheney Twinshock Racing Group - Administrator
'70 Six-Day 125 - V2017
'71 Six-Day 125 (Dave Fisher's) - V5553
'72 Mudlark - W257
'73 Jackpiner - 175 21159727
'74 Berkshire 100 - 40171056
And some silly other bikes...