McCulloch Potrol Grass Strimmer?

I have a McCulloch grass strimmer, unfortunately as a result of an accident the choke control leaver and cover guard have become detached. i would like to purchase a new choke and cover guard, but wish to know the likely cost before doing so.

I have examined the strimmer but cannot find any make or model, except for a telephone number to McCulloch.

Many thanks