The correct ones are cheap enough, any bearing supply house has them they are
- 608ZZ1MC3E
- mine have lasted about 50 years.
- total cost today £0.000273p per day or £0.10 per year
My originals were well shot. I used NSK at first but didn't last particularly long. A pack of 8 skate bearings delivered is the same as one NSK before post. £4 five years ago and still got some left, thats OK by me.