those hooks identical to CASO's are at my local hardware/builders supply stores, no nubs on the end, I put them on the inside of the box on my 58 cuz the holes were already there - the slight bend on the AD was a DIY job
"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