I've been trying to find what the specs are on this bolt but I can't seem to find any info. I have a rubber hose under the manifold on my car and I've been running that for four years now but think its kinking and causing flow problems. I went ahead and ordered the PI Metal tube kit with the new nipple, Years ago I threw away the NPI metal line and bolts, I can't seem to find the specs anywhere. You guys know what I'm talking about right? the bolt that fastens to the drivers side of the block/head were that line makes the curve to bolt meet the rubber hose that goes into the heater core? The npi line had two bolts, and the PI has one and I need to find out what specs the bolt is so I can see if my local hardware store has it.