Seat covers for seat with attached seat belts

Hello
In order to fit the covers I need to temporally remove the lower seatbelt anchor which is positioned to the side of the cushion as part of the seat base, It looks like difficult access.
Has anybody done this?

I am trying to alter a decent pair of covers by putting  the covers over the belts, making a hole at the top, bringing the belt through and fixing it back in place at the bottom anchor. I cant think of any other way to do this......... can you ?

Or does anybody know of seat covers tailored for these style of seats.
Thanks
AngB