[Rattler]

..... I haven't drilled any holes, I'm using the 2 holes that are used to secure the seat latch to the subframe.

I have mounted the latch on the underside of the subframe cross member and used the same fixing screws but turned them upside-down - if that makes sense.

I then drilled 2 holes in the seat bracket that came with the seat and fixed the bracket over these screws - easy

Tim