I would try sportsmatch, have a look at their website
http://www.sportsmatch-uk.com/
if you look at specifications, it lists the sizes of scope they work with, or you can measure you current set to get an idea of height.
Ok, phoned them, what size are the dovetail's on the cz american 452?
I think they are 3/8"
Have a look at the faq on http://cz452.com/
Thats for the American, not the American Varmint.
Sportsmatch mounts will fit 11mm & 3/8 dovetail, i changed to sportsmatch from bkl mounts on my varmint as i was getting around 2'' of crossover @ 100yds with the bkl's from a 50yd zero. I'm not familiar with this particular scope but if it has objective end parallax you will need high mounts, dimensions are listed on the sportsmatch website.
cheers john
Law of any kind only affects those willing to abide by it.
Found these...
Sportsmatch Reachforward 2 piece High 1"
2 piece, High hight mount to fit 1" scope with up to 56mm lens, For 9.5-11.5mm dove tail Base. Reach forward by 25mm.
Spoke to sportsmatch uk again, assuming that it is 3/8 " (9mm) then id best go for the HT08 Double screw 50mm mounts which have the removable recoil pin..