I have a "ta-dah" solution for you - you're gonna look like a hero.
Go to a GOOD "Hearth and Grill" store, and they can custom-make a perfect replacement. You will get quality hoses and fittings from them, plus they know the correct material to use for pipe dope (you CANNOT use Teflon tape, it is not rated for gases) for putting it together.
How I found this out:
We have a dual-fuel propane range in the house, plus a couple other appliances which run on propane, and due to an accident, I have problems lifting the heavy propane bottles we used to use. I needed pretty much a complete refit of the supply system to use smaller bottles, and they were able to help me, no problem. Everything was in stock.
Remembering this, I rehabbed the propane supply system on our trailer this year, and I just took in the regulator and hose assemblies. Again, no problem, everything in stock, plus I got long-enough hoses so there are no more connection problems for the propane bottles.
Hope that helps.