My fathers chevelle

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So I was wondering if anyone can help me with this, my father is the original owner of his 1966 chevelle, it is a SS, 396 with a four speed manual trans, the color is Lemmon wood yellow. It has less then 50,000 miles and has be garaged it's whole life, my question is he ordered the car with a bench front seat and I was wondering if this is a rare car due to the fact most normal people opted for the buckets, any info is better than what I have now.