O.K. I checkd my lists to decode the Numbers
German Part Number: W R 78 G
It goes like this:
W = Thread diameter 14 x 1,25 wrench size 21
R = Resistor
7-8 = Heat range
G Thread lenght 12,7 milimeters
Instead of WR78G you can also take a
FR78G. You only need a smaller socket.
Also you may skip the Resistor F75G
The important numbers are only Heat range and thread size.
An aditional X/W or Y marks the gap size 0,.9/1 and 1,1 millimeters.
Hope this helps.
Frank
