plenty of room to get the pistons out , get the inner out first as it is shallower then the outer . if you try to take the plug out it will damage the threads .the plug was only needed for manufacture .
as i have told you before these are a very poor calliper . people think they must be strong as they are one piece but in reality they are very weak in the centre and flex a lot . if you want to use them just buy lockheed seals they are what spondon used .