The first fix for the STC blowing out was a bracket you installed over the rear pump bolts and to the STC where it connects to the branch tube. This would hold the rear of the fitting in place so it could not be pushed away from the high pressure pump
Well as it turns out out this bracket was metal and extremely rigid, this fix was temporary and a new one piece fitting was designed. Now the new HPOP fitting bolts to the pump in a manner that requires proper alignment to the branch tube. The kit comes with a small plastic bracket but it is no where near adequate enough to properly install this fitting with 100% certainty
This is where that old bracket comes into play
using an old bracket and an extra plastic bolt/wingnut we can now not only torque this fitting correctly so it is level BUT we can also verify that it's depth is set correctly in relation to the branch tube.
The kit instructions state to screw the HPOP connector into the pump 5 full times. The last two I've done needed screwed in 6 times to set the depth correctly so it will line up to the branch tube. The bracket saved me from having to trial and error this fitting
If you ever come across one of these brackets do not throw it out. You cannot buy these, the only way to get one is off of a truck