71GTX471,

From your feedback, it sounds like these hangers were B-body and for use with SS springs. Your statement is nearly correct however, Super Stock / SS Springs are not "2 inches shorter than stock springs" but rather the front segment on SS springs are a fixed 20" long. IIRC, most non-SS springs, will have a front segments 20", 21" or 22" in length depending on the body.

As a result, of the SS spring having a 20" front segment, depending on the body, the front hangers may differ in length to accommodate the body they will be used on.

Hope this helps clarify.