is there any way for me to find out what size my drain and feed flanges are on my oil line kit?

i know the feed isnt a -4 b/c i bought a -4 flange and its too large how can i measure or find out if its a -3 or 1/8th npt???

i believe my drain in -10an again not sure can i measure?

 

I would think that your feed will most likely be 1/8 NPT.
But it would help to know what turbo you are running, and what 'oil line kit' you are talking about.
and really....any other info is always helpful....