There are two main suppliers for wasted spark boards, to fit the Bosch EZ-116K (LH2.4) ignition modules; I got one from each.
+1 for Bijlsma Technical Innovations http://www.bijlsmatechnicalinnovations.nl
Ordered a wasted spark ignition board for the EZ-116K and some kit from Fabian, and this is what I got.
It's a really nicely made wiring loom and the components are all top shelf. I'm very pleased.
+1 also for CFloMoto https://cflomoto.com/
CFoMoto is run by 'Duder' from Turbobricks - he's Normalair Garrett's engineering guy who can explain the complex issues of turbo designs in language so plain that even I can understand them. He's now the supplier for the original Buchka Engineering wasted spark board, which you can order from his site for $67 USD shipped anywhere in the world. I'm also very pleased with Chris' service.