I have 29 piece of flatened 1/2" copper refrigeration tubing I was making for the YHKam cells I just got. but I miss read the measurement of the positive bolt it is 14mm instead of 12 mm. The bus bars blanks are approximately 3 inches long 11/16" wide by 1/16" thick. At 19 mm widethey are a bit to narrow for the yhkams. pickup or if local to me I could deliver. The copper tubing is new.