Searching for Carb Rubbers/Boots/Manifold Rubbers 48mm ID

[ridds]

Howdy all, not a biker myself but after some bike parts.

Do you know where I can get some plain manifold to Carb/throttle body rubber boots?

Then need to be about 46-48mm internal diameter with ideally a 1-2mm ridge in the center.

I know a lot of bikes use these but short of going out and measuring everysingle bike to find the ones I need I can't seem to find them anywhere.

Any help gratefully recveived!