What format was 4cmx4cm? Was it 127? Assuming I can't find the right carrier would just masking off my 4"x5" glass carrier be the best choice? If so is the lith tape sold by freestyle that they call ruby red the right stuff? Or should I go with something else?

I found several negatives this morning. Some are actually from the prints I was trying to copy some represent images I've never seen. I'd like to do this right.