Wanted Prowheel (or similar) 170mm left hand crank arm

[79stef]

I'm fixing up a friend's Claud Butler Windsor (not quite a road bike, but definitely not a MTB and I figure I may have more luck posting in this section) - for some unknown reason the left hand crank arm is 152mm and the drive side is 170mm!

So I'm after a left hand crank arm, preferably matching (a long-shot, I know) the right but anything similar enough will do, as long as it's 170mm in length.

The original is made by Prowheel.
Pics for reference.
Thank you

 

[hamster]

Got an Alivio 170mm for a fiver posted if you get stuck.

 

[79stef]

Thanks @hamster

I've stuck a 170mm shimano (unknown which model) on there for now but it's particularly blubus and doesn't look great.

If you have the time to send a pic of the one you have, I'd appreciate it.