Yep..Marks right.
That was their application/time period,but it was available on ALL new GM Cars when the Column mounted Ignition switch started on the 1969 models....with Red locating dab in detent.
Jim Osborn Inc.has been reproducing both designs:
*DC0760 early 1969 dated 7/9/68 Ign. Start Sleeve 7" long #3961387-$3.50
*DC0721 1969-71 dated 10/2/68 Ign. Start Sleeve 6" long #3964573-$3.50