On my two OM-2ns, I keep a 28/2 and an 85/2. Both have hoods and lens caps, but the caps don't work with the hoods, so I have to take off the lens caps and screw on the hoods in order to take pictures. This is less than good.
So off to B&H, and two Olympus lens caps found that fit on the hoods:
For the 85mm/f2 hood
- a simple push fit success.
For the 28mm/f2 hood
- this one took an Exacto knife to shave away some plastic but now fits nicely.
I had to wait a couple of weeks as these are not always in stock, but what's two weeks in the life of a camera that will last a few decades more?