Kinda funny. I asked that question 4-5 months ago and got a very basic opinion saying they are garbage. I dont know personally, didnt try them. I ended up finding some another member had built and switched out to put Konis in.
It would be better in my opinion to Modify your existing struts and use coil over sleeves. They would then be adjustable and give you more wheel clearence. That way when you want to spend the money, you can just transfer over the coil overs to a good set of struts down the line.
Unless you have proper offset you will run into problems. I have 235 60Rs in the back and they have rubbed the fenders and have worn holes in the wheel well liners.
I guess no one knows what brand those shocks really are - could be anything.
I fitted Konis all around on my car 20 years ago and they were a great investment.
Today, I'd look at BC Racing, which is what I use on my Solstice. $1K a set and well worth it, but you'd have to see if they can make them up for the Fieros. Adjustable abutments and rebound etc. The next step up from there is about 3X the price.
Make sure you do it the way described in the link that was posted and not the way those "coilovers" were made with the coils on the stock spring perch...not enough travel. I used A-1 Racing sleeves and adjusters and Black Magic Racing Springs. I forget what size exactly, that's just a generic link to them. They seemed to be the best bang for the buck from what I could find.
Even if they work fine. With the little extra cost and effort of building your own, you'll gain much more adjustability and probably longevity. Not to mention you can just switch them over when its time to replace your struts.
