I acknowledge receipt of your reply. I have reviewed the parts manuals and can see the parts in question - though I had obtained this information directly from the McCulloch manuals prior to raising my query with you. From what I can establish, and your answer has not provided me with any progress, is that the McCulloch parts, as shown in their manuals, cannot be purchased, and delivered to Ireland - nor can the substitute parts. I am disappointed that I am no further to acquiring a useful solution.
I have spoken to K&T this afternoon, they would be happy to supply you with the parts your require but sadly these head units are no longer available, it would seem that McCulloch went out of business and the trade name was bought by another company with most of the new products being made in Poland. Kevin the owner of K&T stated that unless you can get a copy part from an aftermarket supplier you wont be able to source the part you need. - Ian