i believe you're reffering to the 'intake couplers'. The ones on the cross over tube are easy to replace!
1) disconnect battery
2) disconnect DIS
3) Remove 2 bolts on top, and loosen up screws on 'couplers'
4) wiggle it off.
Follow steps in reverse for putting it back together.
I have to ask, why are you only concerned with replacing those? Chances are they all should be replaced, but i guess it really depends on what your plans are for the car. Good Luck!