What's up with it Rob?
When I spoke to the supplier they said it was suitable for light rods, 1-5 weight. On looking at the reference number on the invoice, it seems the seat I have been sent is for #7 + and is the same one Ben has ordered for his switch rod.
Its in the post office still, so not seen the size, but it does appear it will be too large for my #4 bugging rod I am building
The small one is not available so the search continues!