Aqua roll and water pump size

Wetherbywanderers

We recently bought a new Bailey Pursuit caravan and on our first trip away with it found that the new water pump that was supplied was too large to go in our aqua roll water carrier. Does any one know how to adapt the pump or the container so we don't have
to replace our existing 2 aqua rolls ? We've tried searching on e-bay and google, but not found anything.