63 Dodge Dart, now let me see;)

i pressed the 'hump' down while wiggling it and it settled in one place fitting the floor contours all round. i drew round it and cut the floor about 3/4" in from that line. the hurst comp' shifter with 'a' body bracket lined up in the hole spot on, but as you say the hole's much bigger in the later hump. worst way you elongate the hole and use a different (later) boot and bezel.
neil.