Ribbon cable to connect 542 keyboards to 540 boards

[lowrybt1]

You know the 3' long ribbon cables with 16-pin DIP headers on both ends: one end plugs into the 542, the other into the 540 (or perhaps 505 to A-15)? Well, I've learned the hard way that the pins are really flimsy and break off really easily. After searching, I found and purchased 12 of these cables. If anyone ever needs one, let me know. $10/ea