There is a new source for upper and lower low friction ball joints with .5" longer studs. Summit house brand has them listed as circle track joints. They're not offered as an option for g bodies in a search so you will have to type in the part numbers in their search function.
Upper = 77-1091002 $39.97
Lower = 77-1130002 $39.97
Upper = 77-1091002 $39.97
Lower = 77-1130002 $39.97