The 4/67 MPC I have handy shows two different part numbers for the MS and PS +
Interesting that it does not show the part number shown on the box that you listed
Checking the MPC the kit used (for dealer installed which should be the same or close to assembly especially for your specific need) C5ZZ-3A634-F which is the linkage kit (added to the other kits) shown in the picture below
Hope this helps
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![](http://i44.photobucket.com/albums/f49/firetrainer/6cylinder65-66MustangPS.jpg)