I just replaced my orginal box with a flame river. I will say its a bit of a pain if you got power steering to install. I have both the orginal and a grant steering wheel. Both fit great. My Grant wheel has been on both the orginal and later and fit well. I will say save your gaskets for the tube, because they are a pain to find new. Right now I just have a cork gasket around mine.
The wireing is a bit if a pain. Make sure you take good notes on where your orginal goes so you can easily install. Their instructions helped alot, however white turns yellow and yellow turns off white. hehe sometimes just a bit of a pain.