ok a bit of a noob question, but i need to find the specs of my rims...

so i've taken photos of the most obvious markings on them


(this i'm assuming is the rim production number as the other 3 rims are stamped conscutively)


(these are the most obvious ones i could make out. does this mean the rim is 18"x9" ...not sure what J is with a 60 offset?)


(same with this 18"x8" with 48 offset?)


and these are the rest of the markings which i can't make sense of...












the rims are racing harts if that helps.

cheers for any help.