It’s very expensive to produce different molds for each model type considering the small amount of units sold. So most companies try to fit as many of their models with as close to size and scale of their wheel range they have... at 1/5.7 your tire should be around 5.5” dia .. the A and E have different tires.. different struts too , SM did only the later E/F type of struts. And enlarged their A model to fit to their E struts .