well, Im going to side with "get the ford removal tools (or a coathanger bent right) and see if the plug matches up"

My feelings on this entire endeavor: whats wring with aftermarket? and sicne there is no adapter i canfind.. MAYBE it can plug in just fine... kinda makes some semblance of sense ya know.. since nobody make sone,, but kenwood/alpine/pioneer have adapters.... maybe not tho.. since panasonic clarion and (maybe) sony dont...

I would say pull the HU and check.. solve the problem with 2 hours of work.. probably less