That's understandable. A lot get broken beause people (including some who work in the trade) don't know how to remove the cover plates.
To get them off, curl your fingers behind them and pull them straight forwards, taking care to avoid twisting.
If you twist them, which seems natural and instinctive, one or both parts will be irrevocably damaged.
As with all plastic trim removal, better done on a warm day than a cold one; at this time of year, judicious use of a hairdryer is worthy of consideration.
I believe the covers are available (at a ridiculous price), but the clips in the scuttle cover are not; you have to buy the cover complete, at an even more ridiculous price.
You could try a breaker, but be aware there's a good chance that any secondhand scuttle cover will already be damaged, so look carefully at the photos and ask the right questions before purchasing.
Once they're a few years old and the plastic has aged and degraded, removal without causing permanent damage becomes less likely.
Probably best to improvise a solution.
