I purchased mine from Year One and I'm very pleased with it.
I purchased one for my 70 Cuda (sold years ago) from Year One as well and was pleased with it as well.
I installed my own this last time.
Here is the link from here.
http://www.cuda-challenger.com/cc/index.php?topic=97175.150And a member here Rob (ShelbyDogg) did his own. Here is his link
http://www.cuda-challenger.com/cc/index.php?topic=44869.150His install is what inspired me to attempt it myself.
The only special tool you really need is an upholstery staple gun and glue.
But if you have the extra funds, it's probably best to have someone else install it because there isn't much room for error.
I didn't have the old top to go off of so it made it much harder but if you have the old top, it will surely make it easier to install.
I did mess up in putting staples on the rear top corners (shown in the pics of the link) when I shouldn't have. It would have been perfect if I didn't, but I'm still happy with it.
If I have to get another top, I would certainly do it myself again as I know exactly what I need to do now.
Good luck,
Tom