Our Jetstar is getting a new paint job...yeah! We're looking for a new rear bumper to complete her new look (ours has rust holes above the exhaust pipes). Any info. you pros can give us would really be appreciated. Like what years are interchangeable, or even where to get one would be great.

p.s.
We also need an 88 emblem for the driver's side fender.

 

The only bumpers that interchange with a '64 Jetstar 88 would be from another full-size '64 Oldsmobile (98, Super 88, Dynamic 88, Starfire, Jetstar I). No other year interchanges. These are not reproduced, and rust-through such as yours has is common. Your only hope it to find one in good shape from a donor car. With luck, someone on here might have one, but people posting "need a rear bumper for a '64 full-size Olds" on this site is a common thing. Good luck.

 

The 1964 Oldsmobile Rear Bumpers (or most any bumper) that are rotted out can be fixed.
1. Measure where the attachment brackets are on the back, or tack weld with straps that go to another location on the bumper to maintain their location.
2. Cut out the rotted section back to good metal.
3. Butt weld in replacement metal piece. (It may need to be bent a bit if it extends into the bumper fold)
4. Weld brackets to back side and remove straps, if used.
5. Grind and sand flush and smooth.
6. Take to Rechrome shop

Obviously, the most critical part is how well the weld is finished.
Worst case, you get some ripples and uneveness after it is chromed, but much better than rot holes.

This method was used even back in the 1970s as these bumpers were rotted out even then.