Fasteners, screws, bolts, etc.

[RelishingPickles]

When changing out my engine air filters I notices the airbox screws heads were super rusted. I’d like to swap them out for new ones, but not really sure the best way to source them (or any other fasteners).
Is there some master list of all the fasteners used on these vehicles? Do I need to go to a dealership, or just any auto parts place? Is there a website that I could source them all from?
I’m in Canada, so that might add some complications, not sure.
Any advice appreciated. Thanks.

2013 LR4 v8

 

[alldazed]

You could try a specialty fastener place such as brafasco or fastenal , both in Canada .

 

[RelishingPickles]

Ok, I know there is a fastenal near me. I'll just walk in and ask.

I was looking more to find out about the specs of each fastener though. Is there no reference?
What does everyone else do? just buy from the dealership?

Thanks