Wanted: 7-1/4 Sure-Grip for '68

Why not a a-body 8 1/4?
1) want to minimize costs (ie: no need to change drive shaft and other components)
2) want to maintain existing bolt pattern for the wheels (see #1 above)
3) have completely replaced brakes on existing unit and do not want to have wasted the time or cash
4) NO plans to race the car at all. An occasional squeal of the tires is desired but I have known this car for >30 years (owned it for >20) and am very attached to it.