So I bought the Fel-Pro gasket kit to re-assemble my block. It comes with 3 o-rings in different colors. Black, Red, Green. Which one is the one right one to put on the oil pick up that goes into the oil pump? I know the stock one was Blue. Each of the 3 seem to be a little bit different in size. Unfortunately I don't have the blue one anymore to try and match up the size. Anyone know which one I should use?

Thanks for your help!

 

I used black from what i remember. green was a lil fatter and for the truck pick up i believe I didnt have the red. These came with my LPE high volume oil pump.