Diffuser Issues. Please Help

hey everyone I'm having issues with diffuser in my current water pipe. i broke mine and haven't been able to find a proper replacement for about a month. i have been to local headshops and google searches and after my 4th one I'm deciding to kick my search up a notch lol.

I currently have a 20.5" Skyglass tube. its 18mm to the tube and 14mm to the bowl. the tube on the diffuser needs to be 6 1/4'' from the frosted part. it needs to be fairly precise. i think this has been my issue as i haven't been able to find an exact one yet. they keep breaking from either rattling around when taking a hit or being too long and hitting the bottom of the tube. i was wondering if anyone here could maybe help me out it would be greatly appreciated. will post pics of everything tomorrow morning, its kind of late here now.

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EDIT 1: screw it it was easy enough to add
EDIT 2: This was right before i cleaned it. that's dirtier than it ever gets lol