What tyre size to use and where to buy part worms from?

[Leglessracing]

Hi everyone,
I've got a set of 18x8 oz Alleggertia wheels and am trying to decide on tyre width. I've seen loads of 225's available but I've only used 245's on the wheels before. Can I get away with 225's? They are loads cheaper!

Also I'm looking for dunlop dz03g, yokohama ad08r or federal 595 rsr at a push
Is there anywhere I can get them apart from eBay?

[Leglessracing]

Thanks everyone!
I will give the 225 section a go!

Hopefully I can pick up some part worns at a decent price!

Dam spell checker changing worns to worms!