Websites for parts

Good afternoon,

I’ve recently bought a KTM 390 Duke ‘23.

Currently has 11k km, and last oil change was at 7500, or so the invoice says.

To make myself feel better and more calm, I want to do an oil change myself, since the bike is already out of warranty.

Does someone know what website is the best to get all the parts necessary like the meshes, cap, filter, within Europe, preferably Netherlands.

And is Motul 5100 15w50 oil good? Seen it being used a couple of times.

If anyone has any answers to my questions and / or further info / tips, it’s always welcome.

Thanks in advance!