I saw a center link (drag link) on ebay today if you’re still looking for one. Right now there is about 6 days left on the auction. Looks to be correct by the photograph.
Here’s what the add description says “1963 OLDSMOBILE F-85 STEERING DRAG LINK NOS. GM# 5677800. This is a New Original GM Steering Drag Link Correct for the 1963 Olds F-85 and Cutlass. The Drag Link has some paint loss and has acquired some Cosmetic Rust over the Years in Storage at the Dealership but Is New and in Good Condition. Great Hard to Find Item for your 63 F-85 Restoration.”