I suspect that 90% of the work could be done with a single kit. That will get one card out of the chassis. But, there are always those annoying problems where getting two cards out can make life a little easier. With two kits you could also hack up the extra 44-pin board to make a smaller board (or boards) for getting the odd-ball cards out (if you can find the required edge connectors). So far, I've only needed to do a single card... I suspect most TM500 people will want two cables, but that depends upon what modules you have. Most modules just have one connector. Some of the fancier ones use two. And a very few use three. I even have a custom module that has 4... At first, I didn't think that the TM5000 GPIB extender cable would be all that important, but I have wound up using it several times. ------------------ Hi Mark - do you recommend one 5370 Extender set or two?