I'm not sure I completely followed you there.I think I got confused.The base with the guide post is the one I got of you.It also had the letter I between the engine mount bolt holes at the back of the base.I'm sure I posted pictures of them in the other VC topic.The one that is now closed.Also when I looked in my photos of the Mark I & II when I first got them I can clearly see no guide post.That's what I trying to work out.From what I can see here that one does appear to be a Mark III base.As the other one I have here is almost the same.There are also some little different's under the base.It looks to be more about strengthening the exhaust hole.My problem is I can't really use a Mark III base to do a Mark I or II.It wouldn't be right.So that's what I'm trying to find out if it is a Mark III.If it is I may have to cut the post off so at least it would be visually right.
