I found the shock I was looking for, I had to buy a pair but I got a good deal. So if anyone else is doing this conversion and needs one more front 300ex shock(which is what the kit calls for on the rear)let me know because I will have one left over. Also anyone considering doing this kit just to let you know he claims on his website to have found all the parts to do the conversion for around $350-$400. I have been hunting down these parts on ebay for a month now and have finally found them all and got them at a pretty good deal, but I am going to have about $850-$900 in this conversion and that doesn't include the wheels and tires or shipping of all these parts! Don't get me wrong I am not complaining I think this is going to be a great upgrade for the TRX90 and well worth the money, I am just letting people know what it ended up costing me so they will know if they are considering doing this.
Thanks!