There are two styles of battery trays in the 1961 to 63 F-85’s. All Jetfires, ’62 and ’63 were shipped with the top bracket style. (Maybe the Turborocket engines would pull so many G’s that they would dislodge the battery from the base clamped tray style! Ha!!!) All ’61 -’63 F-85’s, except the Jetfire, had the base clamped style. Pic attached.
Your tray may be good? You only need the “Z” angled clamp (retainer) and bolt to secure the battery into the tray.
I would suggest that you clean the tray (sand or bead blast) then have it powder coated or coat with an aerosol undercoating product (that is what I do).
The battery you purchased should fit the tray or this won’t work!
I do have a couple of the retainers if you need one. Send me an email.