Hi folks. I'm new to the forum. Just now spending time on my 69 GTO convertible again. I'm researching my Rally II wheels and they have Wheel code M4 8 8 @ 6 JT. From what I read this means they were manufactured on August 6th, 1968. I understand that M1 was Made in the USA and M5 was made in Canada. My question is WHERE was M4 made? And was JT correct for my car with front disc brakes? Does anyone have a solid source for this original information? Thanks.