There are a lot of hoe attachments not only made by Bobcat that will work. Just me sure its not too heavy for a *7* series loader to lift.
The only thing you will need are attach brackets to hold the hoe to the frame of the machine. If you rely on just the bobtach to hold it, you get thrown about BAD. I have done this..... When i found out i needed brackets i built a set and its a treat to use now. You will already be plumbed for aux hydraulics to the quick couplers. Just hook up the lines and push the right lever to the right and it should lock in. Then your set! If the detent balls are worn you may need a strap to hold the lever out to give you constant oil flow.