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@mr_bojangles
@saxondale-Have you done this conversion yourself. Without taking the p155, if you can't grasp the concept that a fat post will not fit in a thin hole, the maybe mechanics and engineering aren't your forte and you should get your bike checked for your own safety. To underline the principle, get a needle. Try to put your finger through the eye. It won't fit. Can you do anything about this?-No. Now get a bit of cotton. This is much thinner than your finger and will fit through the eye of the needle. Now imagine that the eye of the needle is your bike frame, your finger is your existing seatpost and the cotton is the one you need.
You need to measure the inside diameter of the seat tube (bike frame) accurately with vernier calipers (or get someone to do it for you) and buy the correct size seat tube.
Hope it all works out for you
Peace
Kurt