There are two tools must be used to inspect root Bushing , 1) Go & No go gauge (to test thread diameter) and 2) Test bolt ( To test concentricity gauge).Go & No go gauge is a tool as per ISO , So you need to create local tool number and maintain this tool number in total tool list of the respective factory, where you track the calibration of it.If you want to create a common item number for M30 & M36 gauge tool, please contact Regis Bensoussan. As per my opinion, common item number is not required since these gauges are off the shelf products. Test Bolt is LM designed tool , So it comes up with item number ( It will get change whenever there is dimension change in bushing). But go and no go gauge is standard tool for every thread size, we need to buy this as per thread size.