i don't see them on ec or yambits, but HVC seems to have them. i would go this way:
https://hvccycle.net/yamaha-r5-ds7-intake-manifold-carb-joint-278-13555-00-00/
https://hvccycle.net/yamaha-r5-ds7-intake-manifold-carb-joint-278-13555-00-00/