Does anyone know where to get polyurethane motor mount inserts? You think like autozone or advance auto parts has them? or do i need to get them online?

This is my first time installing new sparks on a dsm. I picked up NGK BPR7ES and i wanted to know if there is a certain way to install them? do i need to mess with the gap? how much do i tighten it? etc etc

I took my GS-T to get a blow off valve installed that i ordered (turboxs rfl) and they told me it'd be cheaper to buy the adapter from them instead of having them weld it. So i said okay. And then the guy tells me that i need to go buy a plug to plug up the open intake hose but in the mean time...

lol. I was installing some reverse glow gauges and i didnt know you couldnt take all 4 screws out of the boost/oil gauges on the left. so a piece fell out and um... now they dont work :) The piece looks like this:Anyone know where it goes? There is a goldish/yellow one behind the oil...

Which HKS exhaust has 3" pipeing?