It’s an ADG684 but there’s loads of different versions and I have a feeling there was more than one dispenser type on these.
Presumably this is an “order/price the part before attending” ?
Ask the customer to drop the door down, the rating plate is on the door sides somewhere ADG684 will have more on the end of it, the 12nc would be best though beginning 8511 ?????????
Found one at local suppliers in sealed bag that must have been in stock about 10 years (no part number). Looked the same but went to fit it and found the shoulders that house the flap door hinges were thicker so the seal did not mate with the door. Some careful trimming with a knife and profile reduced. fits perfectly.