Beston shows that part number as being a 500 bill magazine.
https://www.betsonparts.com/a6-15scpus4-110-v-validator.html
So, as Beebl points out, it may not fit unless its the correct DBV coin door. And smaller replacement bill boxes are not usually dirt cheap.
FWIW, it was our experience that you will have more jams with ICT and Apex acceptors than with MEI. You are better off getting a good used MEI than to worry about buying a new acceptor.
When new, the Magazine size is in the MEI part number : Near the end (Like U3E), U (Upstacker) or D (Downstacker) 2,3,5,7,10 (200-1000 bills) Last letter, E for single price harness or M for MDB (Vending) harness. But when buying used, beware of exactly what size magazine you will receive.