Hey all, long time lurker, first time poster.

I have an 07 fit that was missing the rear headrests when I bought it, not a big deal, I can buy a set on ebay fairly cheaply. My question is, does anyone know if second gen headrests could fit into the first gen rear bench? I have my seat folded flat most of the time so the second gen ones are appealing to me because they are more compact. If no one knows for sure, can someone give me the measurements for the second gen posts that they attach with?