Here is a used AFCO adjustable j bar. It is about 21" long from center of heim to center of heim. Good shape.
AFCO Double Adjustable Canister Threaded Body Aluminum Shock IMCA UMP WISSOTA
Afco 20110 Adjustable Spanner Wrench IMCA Circle Track
AFCO 21" Panhard Bar J-Bar with 3/4" Heims Late Model Race Car Port City
for VELOSTER 19-21 Adjustable Coilovers Lowering Kit Hyper-Street II by REV9
For Mercedes-Benz S-Class W223 21+ Adjustable Air Suspension Lowering Links Kit
AFCO # 3190CA Aluminum 8" Adjustable Coil-Over Shock (For Rebuild Only) DR36
