WTB: 36" American Threaded sharkfin tab shaft

I'm having a difficult time finding a 36" (or anything 36"38") threaded American notch shaft with shark fins for my 80cm wood gun. Pictured below for length (measured from muzzle tip). Any thoughts on where to look? I've tried all the usual suspects... I wouldn't think this would be a hard length to find due to the abundance of 75-80 guns out there. Hoping not to go custom.

Hit up Dean Koutras with Addiction Spears on instagram (@deankoutras). He makes some of the best shafts. Tell him the specs you want and the details on the gun you will be shooting and he will make you a good spear. It may be helpful just to chat with him on the phone about what you need and what type of hunting you will be using it for.

Here's his website:
http://www.addictionspears.com/

Hit up Dean Koutras with Addiction Spears on instagram (@deankoutras). He makes some of the best shafts. Tell him the specs you want and the details on the gun you will be shooting and he will make you a good spear. It may be helpful just to chat with him on the phone about what you need and what type of hunting you will be using it for.

Here's his website:
http://www.addictionspears.com/

I figured you might have the info. I reached out to Dean. Thanks man!