Good point about bleeding the forks. Usually not much of a concern for road riding, but off-road you should bleed them once a day or so. For part numbers and more help it might be useful to know your bike model, but maybe this helps:
KTMWorld - KTM OEM Parts
I have no experience ordering anything through them, but it has parts catalogues, part numbers, sometimes diagrams, and prices on all parts for any KTM model ever made ... Having said that, for fork seals aftermarket items with the correct dimensions ought to work as well ...
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