Yeah unfortunately that CRT is done for but this should be a drop in replacement. You will need to adjust the geometry and such after install and make sure you read up on replacing the tube and adjusting the yoke.
Good news chassis has been sand blasted, primed, painted, and clear coated. Somehow original logic board only has three bad ls chips and two broken traces. So safe to say she lives!
Well you're in luck. The apple part number for the ROM Simm for ANS 500/700 is 341-0833. There's actually one available here for 36 Euros as well as multiple spare parts.
https://www.xs4trade.net/product_info.php?cPath=1_5_23&products_id=40&osCsid=61ebet7pjv4c9b0aggupn9ljo2