67 stripper and bc69,
Rick's has 67 firewall bracket # CUR-1 in 2014 book, page 74. The 67 Chassis Service Manual (accessories 15-2) and the 67 AIM RPO K30 have good component operation and illustrations.
68 bracket is different as it has different mounting hole dimensions and other small differences. The wiring harness and engagement switch are also different
Parts are extremely hard to come by as not many where factory installed in 67 and 68.
Let me know if I can be of any further help.