Thank you for your email, the item you are requesting is circa 1991 and is a unistart option A board, this component is now very difficult to source.
Our partners at S2S are showing none in stock, and will inform me on Monday if it is possible to source this item at all.
It might be time to consider a new up to date device and replace the unit with something that can be serviced with currently available spares.
Please let me know if this is a consideration and I can assist you further.
Best regards