Also that's not a Carter Mini Monster. I think that's made by Manco. Still trying to figure out exactly. I have a body for that model I might modify to fit my mini monster. It probably came with a 5hp.
I'll check mine tonight. Didn't notice one there. We definately have different frames. Maybe they made different generations? If it's the stepside truck body that you have it's about 1" too short to fit my Carter. I'd love to know who made them. I'd like to try to track down an original frame for the stepside. I'm gonna figure out how to post pics later today. I'll try to share a few pics of mine so you can see the difference.