It is oval, 35mm wide x 25mm
Toss them like I did and use wood screws to attach the handle.
Old handle is probably riveted on. You will need to either take a hammer and cold chisel and cut the old rivet out or use a Dremel tool with a cutting head. I used wood screws to attach the new handle to the shovel. Remember any time you use tools to wear the proper safety gear gloves and safety glasses. Hope this helps.
It is oval. 35mm wide x 25mm.
It’s been a couple of years since I put the new handle on. If my memory is correct they were both rivets. I chose to attach my handle with a machine screw and a lock nut.