Teac 1/2 inch tape lifters maybe !!
I got a bit confused with some lifters that was lying in a box here donkeys years
These look like they have half inch wear but had only broken one half inch machine and i have the lifters for that, I may need to consign these to the " I dunno" bin but have put them here until I can find out what they really are, some are with springs some just the metal lifters
Compare with what you have there and see