Spare tire wheel well on 1964 Plymouth Barracuda...what size 14 inch tire fits?

The original carpet in my 65 Barracuda (which I've owned since August of 1968) had thick jute padding on either side of the spare. Today's replacement carpet has some padding (not jute), but it is not as thick. That would doubtless make a difference in whether or not there's a bump for the spare tire and its board. But I can no longer remember whether my original trunk carpet lay flat or not. Kinda doubt it lay completely flat, but ???