are chevy 6 lugs all the same?

[13lazer]

the bolt pattern is 6 on 5.5" center to center of opposing studs. same as lexus, toyota, some datsuns, and others im sure. the centerbores and offsets are another matter. i recently found out that the bolt patterns are somewhat standardized for most car companies. a few like mopar and some europeans use oddball patterns. i have an extra set of 17's from a lexus lx 470 that look ok. but i need adapters at about $40 each on the rear of my c5 to move them out an inch or so before i can run them.