So i installed an e-bay header and just noticed that the bungs are different sizes. Here is the problem, the egt sensor and aiv flow tube only thread to the lower bung. The upper bung is to small for either. What am i missing, do i need a different sized aiv tube or smaller egt sensor? And if so, where can i source either of these parts? my car is in final stages of it "rebuild" and i whould hate to keep it on jacks any longer than nessesary.