Someone was asking last week about the length of a GRA throttle body (I can't find the thread), I just measured and it's about 148mm long on the actual throttle body. There's the gas inlet peice that does stick out further. let me know if you need more measurements.

That was me, thanks for the info. Yeah they are 148mm in length to the end of the throttle body but they are 170mm to the end of the metering rod and then there is the gas fitting in the end of that adding more to the length. These are the measurements I got when I went to see a gas research fitter.

Thanks again for your effort.