hmmm i have that same problem...though ive been told if those are bad you may want to check the rest of the plastic window stuff out. www.paddockparts.com has the entire quarter window roller set for both A and B body's
We have these available individually or in a complete kit.
Part number 270006 Metal Clip on Roller 1.00 Each .85 to members
Part number 280079 White Small Hole Roller 8.00 Each 6.40 to members
Part number 280080 White Large Hole Roller 8.00 Each 6.40 to members
Part number 280081 Black Roller 8.00 Each 6.40 to members
Part number 280082 White Roller with pin 30.00 Each 25.50 to members
Part number 280084 Complete 14 piece kit 99.00 84.15 to members
iam pretty sure those parts ar in 71 swinger iam parting out if tou dont have any luck elswere if need be call me at 417-334-2985 b4 9 pm central thanks alan