First of all, I think Quietlines are great tractors!
Replacing your ISO mounts is the best thing you can do for your tractor and its power plant. when I replaced the mounts in my 1250 Nightmare, I used genuine Cub Cadet replacement parts. I was unaware of your choice, but they look decent to me; better than the Moog replacements that so many use, and seem to have decent luck in getting them to work.
One thing you didn't mention in your project is to make the recommended engine cradle modification. this keeps the ISO rails from twisting independently and causing stress to the oil pan. From this forum's technical section, here is the modification plan:
http://www.onlycubcadets.net/forum/s...ead.php?t=4630. This is worth every bit of the modest cost. Either having a welding shop make the repair, or doing it yourself, if you have a welder, it is worth every bit of the effort.
That 1450 is a wonderful tractor! Please keep us informed as to your results. There is all kinds of help here to get it up and running again. All the best to you and your project.
Brian Wittman