I have available to me what I think was called a "Comfort Ride" seat in a 65 2T Chevy truck. It's a 60/40, with the driver's seat having many adjustments. Is this a factory option? Will it bolt into any of the 60-66 smaller cabs? I know that 54's had one that is a rare item, but I'm not sure if this isn't something from a semi truck just put in there by a later owner. Thanks!