Casement window replacement crank/arms/handle

Just moved into a new house w/ breezeway but all the breezeway casement windows appear to be garbage so trying to replace parts to at least get all the 10 windows operational for now before we eventually do major overhaul. About 50% of the casement cranks are broken (handle won't attach/engage crank or missing handles) as well as level locks but trying to figure out how to replace entire crank on 5-6 windows.

Pics attached and I'll need a mix of left/right versions. Handle says "NUPRIME" so don't know if that's who mfg the entire crank system or just the handle. The longest outside arm appears to be 9" long.