where to find an adjustable length PR

Ok so now that im home for the holidays and have some time I wanna settle this god damn valvetrain click Ive been having, i think the PR are a hair too short, and Im looking to find an adjustable length PR to check the length with, preferably inexpensive if possible, and if anyone has experience with this, lemme know.

Thanks
 
I got a comp cams one from summit as well, its marked for a measurement as its turned down...ie. every time the lines match up on one revolution it is = .050 in length. It is still a VERY good idea to get it measured with a caliper though...

also measure the new ones as well to make sure they are the same. I got a set of Trick Flow PR the lenght I need and they were .060 SHORTER:nonono: than they were supposed to be. Thankfully I was able to switch back to my stocker rockers that sit .060 shorter over the crane 1.7rr that had .060 due to shimms due to a lash cap (to fit the valve stem). Still a PITA I was trying to avoid...