Jim - the 55-50 and 67-72 frames are very different, but you could prolly adapt it ... more common is the universal style tube piece available from the vendors
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics