Centurion Extension - Storage Unit Extension module suitable for Centurion unit. Each section increases the depth of the standard Centurion by 110cm (43in), providing unlimited secure storage space. The standard Centurion is 2180mm deep however adding one extension increases the overall depth to 3280mm or 4380mm with two extension. Picture shows one extension added to standard Centurion. Delivery Included - Mainland Great Britain Only. Delivery to all other destinations please call for a quote.