'40/'41 rear spring shackles

[Hotrodvideo]

According to the Mac's catalog, '41 rear spring shackles were a one year only item. I have a Merc banjo rear end and I think it's a '40 or '41 but how can I tell which shackles to use? I also reversed the spring eyes, now can I use stock shackles anyway??

 

[TerryOH]

without seeing what you have done or used in doing it, would make it difficult to tell you, you can now do something else. measure the width and diameter of all the eyelets for the shackles. If they are 2 1/4" wide and the diameter is still 3/4" then the internal parts will fit. the bars at the end of the shackel pins??? The originals are 11A-5468-A, 2.18" C/L to C/L on the holes.