Bosch Dishwasher - needs attention (Kendal LA9)

Bosch dishwasher. It works but in need of a new upper spray arm, as the white part that connects it to the machine is a bit perished. For info the part is Bosch SMS50E02GB/04 Dishwasher Upper Spray Arm. Which costs £29.75 at https://www.espares.co.uk/bosch/sms50e02gb04/dishwasher-upper-spray-arm/pro...