dynamic 88 to olds 98
Unfortunately, you're both wrong. 
Within the same year ranges (61-64, 65-70, 71-76, and 77-90 RWD), the Eighty Eight and Ninety Eight frames and suspension are identical except for wheelbase. The Ninety Eight simply uses a stretched Eighty Eight chassis. Of course the Jetstar 88 used the smaller brakes and wheel lug pattern from the A-body cars, but the suspension arms are still the same as on the other B/C cars.

Within the same year ranges (61-64, 65-70, 71-76, and 77-90 RWD), the Eighty Eight and Ninety Eight frames and suspension are identical except for wheelbase. The Ninety Eight simply uses a stretched Eighty Eight chassis. Of course the Jetstar 88 used the smaller brakes and wheel lug pattern from the A-body cars, but the suspension arms are still the same as on the other B/C cars.
Unfortunately, you're both wrong. 
Within the same year ranges (61-64, 65-70, 71-76, and 77-90 RWD), the Eighty Eight and Ninety Eight frames and suspension are identical except for wheelbase. The Ninety Eight simply uses a stretched Eighty Eight chassis. Of course the Jetstar 88 used the smaller brakes and wheel lug pattern from the A-body cars, but the suspension arms are still the same as on the other B/C cars.

Within the same year ranges (61-64, 65-70, 71-76, and 77-90 RWD), the Eighty Eight and Ninety Eight frames and suspension are identical except for wheelbase. The Ninety Eight simply uses a stretched Eighty Eight chassis. Of course the Jetstar 88 used the smaller brakes and wheel lug pattern from the A-body cars, but the suspension arms are still the same as on the other B/C cars.
The '63-'64 "A" Arm lower are interchangeable between cars but everything else was Year specific.
If you Vehicle was a Ninety Eight, Super/Dynamic "88" or Starfire your year vehicle is interchangeable with each vehicle Model Of that specific year. Hope that helps you to clarify your Question?
If you don't have them, you really need the service manuals for '64 Olds. That year it was a 5-volume sent, and you want all five volumes. Service manuals come up for sale on ebay all the time.
Try www.fusick.com for a lot of what you might need but for almost every thing you'll be looking for go to www.kanter.com, they'll get you fixed up...
Don't overlook your local auto parts store, too. You'd be suprised what you can still buy at your local Autozone, NAPA, etc. Fusick is very good, but it tends to be pricey. I looked just now, and Autozone's website shows all sorts of front end parts available for a '64 Olds 98 (springs, ball joints, tie rod ends, centerlink, idler arm, and more). Most of them have to be ordered, so you'd wait a day or two, but you don't pay shipping as you would pick it up at the store, and if there is a problem, you can take it right back to the store for replacement or money back.
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