P6XA is charcoal with black

http://www.hamtramck-historical.com/images/dealerships/colorAndTrim/1970/70_Satellite0012.jpg

There is no all black in 1970.

Since these seats did not hold up well it's common to see them redone. My 1970 Hemi GTX has fairly low miles but the seats were redone with a velour insert.