My coils is this one, part number M1634. Your older engine may or may not be the same, measure the length of it if you can.

https://villiersservices.co.uk/index.php?main_page=product_info&cPath=8_18_52&products_id=29

This website will have the lead and other bits too. Piston rings, gaskets, ect...

http://www.villiersparts.co.uk/ignition.html