What valve guide is this?

[Russ]

Hi all,
Attached photo shows, on the left, a valve guide from my 51 A10 small fin iron head, and on the right, a Wrong one supplied to me.
It is completely the wrong shape, too short and the bore is too narrow. My valves stem diameter is larger than the bore.
Can someone tell me what the wrong one is?

Thanks Russ

[wilko]

Could be anything?

[BSA_54A10]

Obviously wrong