Here is a used aluminum quick change 3rd link mount.
Quick Change Upper Link 3RD Link Pullbar Torque Link Bracket IMCA UMP USMTS #5
Quick Change Upper Link 3RD Link Pullbar Torque Link Bracket IMCA UMP USMTS
Quick Change Upper Link 3RD Link Pullbar Torque Link Bracket IMCA UMP CAR #47
Quick Change Upper Link 3RD Link Pullbar Torque Link Brackets IMCA UMP
9" Ford Quick Change Upper Link Pullbar Torque Link Bracket IMCA UMP
Dirt Track Rear End Bar Quick Change Housing 3 Tube Sprint Car Modified Link Arm