Downstem step up

Hey guy's and Girl's

I had a sad day occur not long ago. I broke my bong :( it is beyond repair and I have thrown it out, Luckily I had a replacement. only thing is I had a couple of hundred dollars in ash catchers and extra percs. they are all 18.8mm the replacement pipe is 14.4mm sockets.

Does anyone have a downstem or know where I can get one that would allow me to step up from a 14.4 socket to a 18.8 piece?

I know they are easy to get going the other way. I have looked around on several sites, but no luck. Hoping some one can help me out.