Autopower Rollbar Cover
By: iMR2 

This is a laced on vinyl roll bar cover available in Black, Tan and Brown.  The kit is available through www.JCWhitney.com for $ 49.99  I chose the black cover for my yellow Spyder.  You can order the covers from: http://www.jcwhitney.com/productnoitem.jhtml?CATID=65320  As you will see further down, I opted to not use the foam that came with the kit and used a thicker foam which I purchased locally.  It took me about 3 hours to install the kit.

This is what the finished cover will look like when you are done.  I padded the main bar, but not the kick back leg bars.
The kit comes with 15ft of cover material, 20ft of lace and 15ft of padding. There will be plenty of left over material.
The pad (black) included in the kit was not sufficient enough for me and did not fit the roll bar well, so I opted to get some thicker (blue) padding that fit snug on the bar. I got blue, because that’s all they had at my local supplier, but color of foam pad doesn’t really matter since it will be hidden anyways.
Here’s the bar unpadded before beginning.  While there is plenty of clearance between the bar and your head, the padding makes it much safer in an accident.
First fit the padding on to the bar. No need to use wire ties or tape. The new vinyl cover will hold everything in place when it’s all laced up.
Lay the cover over the bar.  Start from one side with just enough slack to tidy up that end of the bar.  You will trim the excess later.
The other side will have the left over hanging off. Make sure you have enough slack on both ends of the bar you plan to cover before cutting the excess material. You can always trim some slack later when it is laced up.
The lace is becomes easily frayed with split ends, making it impossible to thread with. I put a dab of crazy glue on a small section. Once the glue dried up I cut it right there, making it much easier to thread with.
Glued tip, with no split ends makes lacing easy.  It's like having a built-in disposable threading needle.
Start lacing from the center of the roll bar out. As you can see here I started from center out on the driver’s side.
Lace it very loose initially. You will need to go back through it all again several times. If it’s too tight first time through you may not be able to get the cover to fit on well elsewhere on the bar.
Make the final tie down when all is positioned and wrapped on the bar to your satisfaction.  You’ll have to be a little creative when lacing around the kick back leg bars.  You may decide to cover them with the wrap.
Be kind to your fingers and use needle nose pliers to aid in lacing.  You will be pulling and tugging on this tiny rope for a good while, so your fingers will wear out quickly.
Once one side is done, continue on with the other side. You can see the lace hanging in the center where I started. I tied the 2 together (left & right) and tucked it under the cover.
Once you got the bar initially covered and laced up, go through it again and make the laces tighter. Using one hand to pinch the seam will aid in lacing and prevent tears to the material. Be careful when lacing, if you pull the lace too hard it will over stretch the holes creating tears.
Once the cover is on to your satisfaction go through and clean up any excess foam padding, cover and lacing. I unlaced the cover at the ends so that I could fold it up to cut the excess foam padding.  That will make a neat looking installation on the ends of the bar.
This is how it looks completed. I opted not to cover the rear kick back bars, but you may want to continue on. Hopefully this will give you a general idea of how to go about covering your roll bar. Have fun and show us your results!