I ordered a pack of these cards and I am using them with Z573M tubes. Even though there is 13 leads on the tube and only 12 holes in the card, 2 leads are not used on the tubes so I clipped those shaped 2 leads to fit the tube in the card. These are brilliant PCBs and I am most pleased with these! Shipping was to Thailand and only took 1 1/2 weeks, which is very reasonable. I will be a repeat customer....