Injector shim kit, pop-off adjustments

Anyone know where to get a bosch shim assortment kit for adjusting pop-off pressure on these 12v sticks?
Also, who makes a cheap pop off tester? Looks like you can make a DIY one but Im not sure I like the looks of them.

e bay for the nozzel testers, i forgot place to buy shims. there are more than a few of them.

They dont sell just a kit. You can buy some from a pump shop or a bosch dealer. Just a fair warning they are not cheap for the size of them.