Changing the automatic over to a Muncie M-21 in my '71 GS. Trying to do everything like Buick did in '71. Question is, where on the passenger side front floorboard did the hole for the speedometer cable go thru? My automatic car speedometer hole is under the steering column, which is correct for the auto, I would like to change it over to the correct location for the manual, but I can't find anything on the web to show me where it should be. I was told that the manual cars location were different than the automatics. Does anyone have any advice on the location or better yet, some pictures would be a great help. Going slow, trying to get it right, and thanks in advance.