While the Virnig rock buckets are very nice, I think they are still too big for a
B7610. The smallest one is 60" wide and weighs 540 lb without skid steer attachments. You will be at 600-650 lb before you even start digging rocks. A rock bucket is also much longer than a standard bucket, so your curl will be severly limited. For a small tractor, what you need is a 36" bucket that is less than 400 lb. I have a 5' rock bucket and grapple that weighs about 700 lb on my 45 hp tractor. When the rock bucket is more than 3/4 full, it takes all my tractor can do to lift it. Right away, you'll also have to add
ballast to the rear if you don't have a backhoe or something similar.
I think you could build a tiny rock bucket for your specific use or just bite the bullet and pick up rocks in a 5-gal bucket. I'd bet you could find somebody to pick up your rocks by hand and save a lot of money and irritation. I love my rock bucket/grapple, but I think a
B7610 is really too small for a rock bucket.
EDIT: I went back and looked at the Virnig site. They do make a compact rock bucket that weighs under 300 lb (48") as arrow suggested. However, the tines are less than 1/2" diameter. This has to be more of a "comb" than a rock bucket. I guess it might be okay, but I still think a bucket that's 36" wide and has larger tines will be a lot more use on a
B7610. I bend my 1-1/4" tines a lot when I hit softball size rocks or wedge in around roots. I carry a 3' section of 2" pipe with me to straighten bent tines. I thiink the thin tines will really be easy to damage.