Cast your eyes over my calliper pistons and tell me if they’re shot

[darrsi]

Personally I’d stick them back in. I’ve seen a lot worse! If you’ve got an oil stone it would be worth dressing up a bit and a polish with a Dremel.

Same as.
The corroded bits at the top are the exposed parts anyway so so need to worry so much about that area, just make sure you're not shy with the red rubber grease and i reckon they'll be fine.