Corvette: '92 sport seat

Hi All,

Looking for a small part to fix my sport seat bladder tubing. The
small piece that connects the three tubes from the pump to the
bladder, one nipple is broke off the black end. I've seen acouple
places online that sell a fix kit but it has been discontinued. Any
help would be great, btw it's the only thing that doesn't work and
it's driving me nuts. Thanks, Rog