aquilisa replacement cartridge

I am planning to replace the cartridge in a series 200/400 shower - see attached photos. The supply is gravity feed. Can you help me in deciding which cartridge would be suitable? I think I've narrowed it down to 22801 (gery) or 22805 (white) but, since the dimensions are different, I'd like to be sure before ordering
Asked 1 year ago by Ian Kennedy, Marlow (Bucks)
No pictures attached. Grey is the cartridge for gravity systems.

www.showerdoc.com/aqualisa-classic-aquavalve-200-thermostatic-and-400-manual-shower-spares

Answered 1 year ago by Barrie Seabright

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