Bought some Cobra seats and was sold some H plate style mount plates so I can fit to the sierra height adjustable mounts.

However I'm scratching my head on how they fit to the original seat mounts.

Anyone got any experience using H plates?

 

I fitted them, it was years ago, but don't remember them being too tricky?
What bit you stuck on?

 

The holes don't line up with the original sierra mounts.

 

Might be worth checking the measurements with Cobra, incase they're the wrong ones?