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The MCA Judging rules state 64.5 early 1965 speckled, stitched mat with burtex backing. I don't know if a SJ F/B with a scheduled build date of October 1964 would fall into this category.
An October 64 San Jose would not be a 64 1/2. Also I believe the rules reflect only one plant. Not unusual (over the years) for MCA
The rules also mention EARLY 1965. I would consider the October 1964 Mustang as such. Charles the issue probally does need to be addressed at our rules meeting.
I was also thinking that the fastback mats would be different length than the coupe, so regardless of build date that would be different tan the 64.5 coupe/conv. And more than likely be plaid.
If it helps any, my SJ September 1964 coupe had the plaid rubber mat