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Shimano Disc Brake Caliper Replacement - bamboozled

Help from any Shimano experts out there would be much appreciated.

Canyon road bike came with BR-RS805 disc calipers, which are now leaking and need replacing. Nowhere has stock of these or the very similar BR-RS505 or BR-RS405.

Here was me thinking I could just swap out for any of the newer flat mount calipers but the hose size is different. Existing brakes use BH59 hose (2.3mm dia) and all the newer calipers use BH90 (2.1mm) hose, which I assume won't work with the existing levers.

What do I do? Is an adapter available or even needed to use the different hose sizes?

I'm really stuck here so any help gratefully received.

Cheers

PL

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