rally rim offset questions...
 

hey everyone,
this is my first post, go easy on me, i'm definitely not a tech/mechanic! i have a 68 c10 lwb. i want to switch my rims to rally's, but i have questions about offset/backspace numbers. i'm trying for a mild prostreet look with the rims, and before i order these i would like to know for sure what to order. i'm going to add some pictures from a truck i saw that has the look i'm after. thanks in advance for any and all help guys, i appreciate it.