Hey all. I'm collecting parts for a GT350. The car has a Ford build date of mid March. What would be an acceptable date code for the third member? I have two on hand that I could use. One is dated Jan. 11 67, the other is dated Aug of 66. Is the Jan. too close to production of the car? The Jan. coded third member has a fill plug as does my rear end housing. The 66 third member does not have a fill plug. Would it be possible that some were built with both fill plugs? Thanks