Yup, Losi 22 takes saddles in various formats depending on rear/mid motor. Apex have a pretty comprehensive selection of spares as well.
As for radio/servo/motor/ESC, its more down to your preference (sticks/wheels) and what classes you drive/the club runs (not up on UK race classes, not raced there since the 80s), you'd be better off waiting for a response from a member!
(And you will get a bit of a shock when it comes to lipos and brushless!)
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