My bath is 166cm (just measured it!) and the panel I am literally about to order is 170cm!
www.burlingtonbathrooms.com/Products/ProductDetail?prodId=2879&name=170cm%20x%2070cm%20along%20a%20Wall
How does this work then? Presumably my plumber will cut 2cm off each side. It does say in the link below that the Burlington panels are adjustable, but I'm evidently too stupid to understand exactly what that means!
www.bathpanelstore.co.uk/burlington-traditional-white-2-piece-adjustable-bath-panels-15206-p.asp