Mankster, I'm in the beneficial position of having both the toothbar and the cutter bar. As Rambler mentioned, there are toothbars or individual teeth that mount to the bolt holes in along the front of the bucket, but I think you will find the type that slip over the edge and bolt to the sides are far more common. Just do a search in the "Attachments" forum for "toothbar" and you will be inundated with posts with photos of toothbars. Many people have made their own, but I spent about $300 for my toothbar. The cutting edge for my 16LA was about $190 from my NH dealer.
Now, about chain-on forks...
With the cutting edge or with a plain bucket edge the forks are a perfect fit. They have a slot that fits over either one. It fits so well, you just sit them on the edge and they stay right where you put them while you rig up your chain binder. They don't slip all the way back with the toothbar on and you have to allow for the teeth horizontally, but they still work okay. I guess if you had the bucket tilted way down, they might slip off, but if it's level, they stay put. Mine weigh about 75# each.
There are lots of benefits like easy off and on, but there are several disadvantages to this type of fork. Since they are on the bucket's lip, you just can't lift nearly the weight of your loader's capacity. Everything on the forks is about 24" in front of the bucket pivot point. My forks are 4' long and I wish they were 3-1/2' or maybe even 3'. They were really made for a larger tractor like a TN and I may shorten them one of these days.
The problem with the attachment style is the forks have no side-to-side support. If something bumps them in or out, they go that way. You have to be careful to slip them under a load with no sideways movement.
Finally, they can be dangerous. There is no vertical guard. The front of the bucket is the guard, but the two chains at a angle give a easy path for something to slide or roll back on you and/or your tractor. You need to be aware of this with any forks, but you really need to be cautious with these.
I like my forks because they are so easy to install/remove and I stand them in the corner of my barn. I bought them from my NH dealer for around $250 and then the chain binders were separate. I believe the total was about $270. If you can't find any from a local dealer, I'll PM you the name and phone number of my dealer. I think he buys them from someone in Colorado. I scraped off the label during use before I thought to check who made them. /forums/images/graemlins/blush.gif
I'm including a photo montage that shows about every aspect of these forks. /forums/images/graemlins/cool.gif