2wd and 4wd share the same size rears.
2wd end up with slimmer fronts than 4wd, but most manufacturers supply one size of front wheel, where you cut a rib off the inside of the wheel to reduce it's width for 2wd.
I haven't used those fastrax you've linked myself, but they seem to be as cheap as anything else. Someone else may be able to tell you if they're worth their salt.
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For everyone I've confused: Aka Stu
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