I have a 1970's era Columbia tricycle that I attempted to install an ebike front motor wheel on. The axles on the ebike wheel are larger than normal, stock bike axles and would not fit in the dropouts. A little filing widened them enough to get the axle to fit, however the dropout were not deep enough. That, combined with my stupidity, resulted in the motor hub torqueing itself right out of the dropouts when i gave it decent throttle. Fortunately, I wasn't going very fast, and with it being a tricycle, wasn't that bad of a crash. But it woke me up. It also bent on of the fork legs beyond repair. I'm still going to make an e-trike out of this thing, but I need to replace the forks. The problem I'm having is that this older model of tricycle has a different sized fork steering tube than most bicycles you encounter, so I can't just rob parts. I am having trouble finding information about what size fits. I would like to replace the forks with a set that would be better suited for the ebike wheel. Surely there is someone who makes the part that I need. Here is a picture of the trike:

need replacement forks
If anyone can provide any insights on what the size I need is, or where I can find a set of forks that will take an ebike wheel, it would be awesome! If anything, information on or where I can find a stock replacement set would be great too.

Thanks in advance for anyone who takes the time to help me with this. It is very much appreciated.