Murena Twin Weber DCNF Inlet Manifold

[Gib]

murena welch plugs by creativeq

NOT MY Picture

As pictured i need to replace a welch plug as shown in the manifold

Before going full on measuring does any one have the  correct size ? from a  quick clean its 24.4mm.
If this was in the block i just buy a 24.4 welch plug as in steel you just go, like for like. Is this the same for an Aluminium manifold ?