I used a 1" flexible metal putty knife, carefully prying out the plastic at the points where the tabs were attached then pulling them back - I had an advantage, as I'd ordered the replacement covers so knew where the attaching points were. I still had to be very careful as I was keeping the original 'chromeline' backs, so they had to be reinstalled.
This gives an indication of where all the tabs are - the front is on the left, and as there is only a single tab halfway up the outside, it's a good place to start.
As for the price, where did the price of 240 come from? Each grey/silver rollbar cover was only 25 dollars from Tischer (100 dollars for all four). I'd ordered all four as I was originally planning on repainting all of them satin black, and didn't want to ruin the original chromeline covers (which are considerably more expensive than the grey/silver ones).
Look forward to the pictures!