Wondering if someone can help, I have an old surplus of wylex/crabtree rcbos. They are identical in moulding. I wanted to use them up in my new extension rather than for a customer because the mix match branding on them. I've ordered a new wylex nm range db and although the sit perfectly on the bus bar the bottom dosent clip over the wide din rail. You could tighten to the bar perfectly but dosent seem right without clicking in. Is this a different dim rail? Can I just change for a standard din rail as it looks like it would work perfectly or do i need a different db? I dont really use wylex so I'm wondering if they changed there design. I cant see how any breaker would clip onto this. Any help appreciated