Those arms are, or at least used to be made by All-4-Fun offroad (
www.broncobob.com ). Nothing worng with them other than what you stated...they use a factory-style stud for factory style bushings. They will be better than stock, but wont flex as much as the Cage or Duff arms since the stud mount doesnt offer the same range of motion. Plus, you have to re-use or buy the brackets...add the cost of new brackets in and you are not saving THAT much.
I really like my cage arms. They werent too bad to install. They are serious Beef. I know alot of people scoff about $. "I can add extensions" for less than $2-300." OK, also, put a bend in them and brace them--not sure about you, but I wouldnt want to depend on just the stud threaded on, even with a nice circumferencial weld. Add the extra materials, the time, brackets-or materials and time, you will spend more than you think. No, not as much as you will for a set of Cage or Duff arms...thats true. But look at a set of the Cagfe arms up close, pick one up...they are solid. You get what you pay for. IF you can fab up an arm like that, then go for it...but if you had the kind of equipment to do that...you wouldnt be asking, right...so spend the $ and get the good stuff.
Another option, someone on this site was making a few sets of "Lars bars" --modeled after a set first made by Lars Pederson--which are slightly lengthened arms (6-9 " range, I beilieve). These have the bend, were of heavy tube material, etc. That would be a nice option...you can try a search to see if anything comes up. Within the last 2 months or so, I know there was someone who made a few sets and it sounded like they were willing to make some others. Good luck.