More than likely the difference in uppers is due to '63 & early '64 Is that later has rubber bushings as to early has trunnions (a big nut) screwed into the uppers on both ends. I have swapped early & late. I like the earlier ones because with them there is NO DEFLECTION.
The sway bars are the same for the most part. Back in late '69-early '70, with help, I designed a rear sway bar for my '64 Riv. One of my customers ordered one a couple years ago & when I went to install it was TOTALLY WRONG. I took the bar off my Riv. & sent it to be copied last year. The catalog still hasn't been changed as of yet so the ONLY way you can get one is through myself as well as the front bar.
Good quality ball joints are readily available which I can ALSO get for you. IF your price shopping DON'T get the kits that include all nec. parts as they will mostly be Chinese JUNK that will wear out faster than the ones that are in there now. How many times are you willing to take the time & $$$ to change them again in a few years???
I ALSO carry the modified strut rod/brake reaction rod bushings & the rear track bar/panhard rod bushings both in Poly.
I ALSO have in stock fast ratio steering boxes that are 2.5 turns lock-lock (instead of 4 turns lane-lane) along with new rag joints of the PROPER size for our BIG cars. Makes your car feel like it has rack & pinion steering to bring the car up to more modern standards. ALSO the proper revised alignment specs for our BIG cars for MUCH IMPROVED steering responce/tracking.
When it comes time for shocks you can get your regulat Monroe's or Gabriels, BUT after a short period of time you will be back looking for replacements again. I have GOOD shocks available that WON'T wear out in short order, BUT of course they are more costly.
How much $$$ are you willing to spend PLUS the time to do it ALL OVER AGAIN????
Tom T.