Actually the wire he is talking about is used on the Blaze & Moto models and goes from the sub-frame to the hole in the plastic above the footpegs (where the foot baskets used to attach). Black Widow ATV has them in stock, the number is at the top of the page.
I made some from the front fender supports for the back when I removed my heel gaurds. , took a little bending with a pair of vise grips and one little cut out of the plastic and a longer bolt on the bottom side panel bolt
Yes the brackets will help dramatically. You can get the moto/blaze ones or just make some out of old heel guards. I race XC and that means lots of mud, so I made another set along with the heel guards ones, I had a pair of front fender brackets laying around, I taped the ends up so it didn't scratch the plastic. You just bolt it to where you would bolt your grab bar, than spin the bracket until it is gently pressing up on the rear fender and tighten the bolt. It works great and you can't get much more support than that...
i got a set set of fender supports from cannonboomer. kdeal was calling my fenders elephant ears a the group ride because they were saging so bad with no supports
i thought it was you kdeal but could have been someone else i heard marking fun of my broken mud brown fenders. i got the old beater looking good now ill see ya at the next group ride (hopefully it will still look good by then)