Help please identifying possible Gloster Meteor Gun Ports

Hi everyone, this is my first post and Im hoping someone can help me. In my collection of spares, Ive got these items which I was told were gun ports? Ive had someone else now tell me that they could be from a Gloster Meteor? If anyone can shed any light that would be great. There are markings on the neck which are EB2.10,9295,1991 EEP 142