Rockers and fulcrum seat questions

[AU Bronco]

Ok i got these used heads for my 302 rebuild and im trying to figure out a few things.....1)there is a number on each rocker arm 1-16 and the letter w.....do they have a specific cylinder and valve? i looked at my old heads and they have numbers and letters and appear to be in no specific order. 2) I have 8 round, smooth fulcrum seats and 8 with grooves...i assume for oil...again my old heads just had the smooth....which valve do the grooved ones go on....here are some pics
thanx

 

[NoJoe]

Hi: I would put the grooved ones on the exhaust valves but it doesn't matter and the 1-6w probably is 1.6 ratio rockers.

 

[AU Bronco]

thanx....the numbers go from 1-16 though

 

[Skuzzlebutt]

Never seen the grooved fulcroms before. ?:?
The numbers are probably just for conveniance. They weren't made for specific cylinders but just numbered so you could remove them and always be able to put them back on the same valve.