These are two completely different questions.
To answer the second question first, a *proper* roll-bar (NOT a light-bar) helps tremendously in a rollover, no real rocket science involved there. Buy a good one (inteded to actually reinforce the body in a roll-over event instead of just being something designed as a place to bolt lights), install it correctly and you just may save yourself or a passenger from significant bodily injury or worse.
As far as the soft-top question goes, since this question gets asked two or three times a month if you look in the upper right corner of the screen you'll see a tab marked "search". If you click on it and type in "soft top" (please use the quotation marks) and make sure you *un*check the box that says "search this forum only" then you'll get all SORTS of info and I absolutely guarantee that the heavens will part and all the answers will be revealed to you, ya just have to do a TINY bit of legwork. In case you're not able to do that the VERY short answer is that soft-tops.com is THE (read that again and memorize it), repeat THE only game in town. If you want to purchase a soft top from an actual vendor soft-tops.com is THE only choice you have. They offer fastback type tops and that's it. If you have an issue with that or want to complain then please see the archives for the appropriate wailing wall. READ THE ARCHIVES, that's why they exist. If you want something different then search Ebay, Craigslist or you local WantAds but nobody here has one.
http://sf2000.registeredsite.com/~user8531...oduct_Code=FBST
Best you're going to get without searching out & finding a used one on your own.
Used or purchased & never installed tops from different Mfg's are out there but to be honest they don't usually last long. More often than not by the time someone from the forum spots them & posts the info for other members they've been sold so if you *really* want a different style then you'll have to commit yourself to a search.Ck each & every day (several times a day if you're savvy) and chances are that within 6-9 months you'll spot one or two. Bid agressively and you stand a good chance of winning one. I wish there were something more optimistic I could say but that's the hard truth of it. For reasons that nobody understands the only Mfg's except Soft-Tops.com got out of the game and the ONLY new soft tops available are the fastback style that they offer. Now this isn't a problem if you're like me and actually LIKE the fastback style but otherwise I apologize because you're just $hit out of luck.
Hopefully someday soon someone else will realize there are several million 80-96 Broncos still out there and pickup the torch & run with it, but until then it is what it is and we can only deal with what's out there waiting to be purchased. Search your local WantAds & Craiglists and don't give up. chances are it may take 12-20 months to find what you want but if you keep looking you'll probably find it and I know for SURE that if you stop looking you *won't* find it. Sorry man, wish I had something better but that's the deal.