Detroit Series 60 12.7 Injector Height Question

Can any one tell me where detroit measures the injector height from. I can't find a injector height tool anywhere without oredering one and waiting. I've used the injector height tools before but need to know where Detroit gets the measurement from. It appears to come from the top of the hole in the injector hold down clamp.I can make one but I don't know if Detroit gets the measurement from the bottom of the little hole that the injector height tool goes in or the top. My engine is calling for a 82.1mm or 3.23". If someone has a height tool & a caliper close by and can measure from where the tool sets on the injector down to 3.23" if it's a 82.1mm and tell me if it goes all the way to the end or not. Really if anyone has any size injector height tool and a caliper and can measure this it will answer my question.

 

Thanks for the help. I would like to buy the proper tool but the dealers here in Waco Texas have to order everything. You answered my question perfectly. No need for the tool I'll just use my caliper.