The Arabian Mare and Stallion, Morgan Mare and Stallion, Thoroughbred Mare, Draft Horse and Saddlebred were also included in the 5600 singles series that started (earlier?) in 1989, thereby, these seven singles will be similar to their Sears 1989 siblings, specifically if they were produced around the same time.
The models on this page all come from the same #495600 Sears 1989 box.