Yep, mine is a JD toothbar. I looked at and priced Markham, others via the net, etc. Then, happened to call local dealers to see what their prices. JD dealer had several in stock... sold me one that fit my bucket with about .5 inch to spare... a few washers and the fit is extremelly snug. JD toothbar weighs 139 lbs.... truly heavy.... and, it was cheaper than any alternative, for me, when shipping was included. Check around, ask for weight of each toothbar you look at, number of teeth, price... the toothbar DOES strengthen the bucket lip very, very much although it does also reduce the max payload carry weight. Likely, this is not an issue. It hasn't been with me.
I can't recommend a toothbar too much.
Local dealer allowed me to take home and make sure it would fit inside my bucket prior to purchase. Drill a hole in each side of bucket and bolt in place. Some folks swear that they love the idea of placing the holes such that it can be slid forward then flipped up and back into the bucket, allowing bolts to be retightened, then use bucket with smooth edge. I tried this once, but just don't see it. It's too easy to remove/add... just loosen the two bolts/locknuts/washers and you are done.. takes about 5 minutes to go either way, in my case. I carry a large crescent wrench and a break over handle with proper socket on it in my tractor tool box for removal/replacement in the field.