Hello All- I bought a polaroid back on ebay from Midwest Exchange to fit my 645AFD and I just cant get it to fit. Ive looked everywhere online for somewhere to tell me that the AF is diff than than the AFD back and which back to get, but I cant find any info anywhere.

Heres what I bought: http://www.ebay.com/itm/110767782859...84.m1423.l2649

If its the wrong one, how do I know which one to get? I image the reason is because things changed with the AFD but Im confused because all my film backs work and are not specficly listed as AFD.