Wiper/washer module(s)

The intermittent wipe and washer on my 1992 XJS coupe are malfunctioning…the slow and fast wipe are fine.
I found some information on module(s) - Used wiper delay module DAC6534 and wiper logic module DAC10015.
Can anyone shed any light on which module I should be looking for? and secondly any idea who might have used modules for sale since they don’t appear to be making new ones?

I had a quick look : DAC6534 seems to look like a relay, while DAC10015 is a black box with a 1 row connector

the switch seems to be between 1991 and 1992, so not much help