There isn't a specific kit to fix this unit with, but Home Depot does sell replacement parts to fix it. If you type in hose repair in the search engine a list of products that will help you will come up. I hope this helps.

My handle is on the right of both reels and after inspecting mine just now I see no reason it could not be on either side

Yes, looks identical

This hose reel can accommodate 225 feet of 5/8" hose. I hope this helps.