+1. It’s where a lot of the thumbs and buckets come from for JD. We have 4 for our 160G from TAG that came with the machine.
I’ll add that if it doesn’t have a coupler, you should consider adding one because it makes the machine much more handy. If you already have a thumb, it will mess up they way the bucket and thumb lines up though if you add a coupler. I swap between a 4’ and 2’ a lot, especially digging stumps.