valve guides

hey guys - i have taken the engine apart and is about to put it back together - i have changed every gasket, seal and oring so fare- not yet the valveguide orings - should i change them aswell now that its open or should i just leave them... ?

What is the rubber seal that sets on top of the valve guides official name and where can I buy a set?

Just received 4 new valve guides from Mikesxs. My old intake and exhaust valve guides had red o-rings on them (see images). Not sure whether I have the o-ring on properly in image 1 and image 2. YES, I DO. If o-rings are needed, what is a part number for these, either OEM or Mikesxs...

Hey Guys, it's been a while since I've been able to work on my motor but I'm at it right now and I removed the valve springs and valves but I can't get the valve guides out... I've got the valve guide remover tool from mikes and I assume you just push the guide out from the bottom, yeah? I...