Not sure I understand your question the Part number 1364865 is a 1964 15 X 6" Big car Rallye wheel with a 5 X 6" bolt pattern. That means it won't fit the Skylark/GS, just the big cars, Electra, Riviera, Wildcat, etc. http://www.v8buick.com/attachment.php?attachmentid=158600&d=1264095216
865 is not a Buick rim code to best of my knowledge. If you meant 895, it is 15" for 71 and later full size models, 5" bolt circle.
Thanks Larry I'm trying to track down some rallys for my '68 Riv and the guy I'm dealing with only has the # 865 off the wheel. Still not sure they'll go on a 68 with the big drums.There is apparently a welded in ring that needs to be in place.