haven't seen that tip, can you link it? all Chevy caps from 30's to 1960 have the same mounting diameter, only real difference is before 55 they used 6 clips, 55-60 used 3 clips
"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