I have a 2003 Bav 32. There are spare spare connections available on the switch board – 18, 19 and 20. Can somebody tell me the size of the female crimp terminals I should use to connect to the square block (see picture) into slot as labeled for spare switch on main panel. I bought what looked correct terminals, however they will not clip into block. I have resorted to using a female spade connector onto my macerator vacant terminal, however that has a large fuse. I am connecting to a TV antenna booster, so would like to use port 18 that has smaller fuse.