Glad I could help...
If you measure the diameter of the magnet, I could tell you if you have the "extended range speakers" option. If you have this option and you choose to junk the old speakers, I will consider buying them from you for my '86.
BTW, the door speakers on the Buicks were actually semi-surface mount. With some cutting (

), they would fit into the Olds also.
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-Rob Young
1972 Cutlass Supreme Convertible (442 clone) -"Lady" (My mistress...)
http://www.flickr.com/photos/robsalbum/sets/
1986 Cutlass Supreme Coupe - "Pristine"
1978 Ford (Old Faithful) a.k.a. "the Tramp"
1997 Cadillac STS (for sale - too many cars!)
1999 Harley Davidson Sportster - "the Freedom Machine"