S & W has what you need, and if you can wait, they discount them about once a month. I've purchased 4 cage kits from them and have been very happy with their service and product.
Kit 11-2033 is the 8 point
Kit 11-2533 is the 10 point
Kit 12-2033 is the 12 point
My catalog says 65-66 Dart, but it fit my 63 like a glove.
Their number is 1-800-523-3353 or
www.swracecars.com