DavidC ,
The fuel sender unit is not a Lucas part but a Smiths part which were supplied to BAC with the dash instruments.
I understand the sender unit for a 401 - 403 is Smith # Y70236 which has an arm of 7 1/4 inch measured from pivot shaft to centre of float .
There are often reproduction sender units on Ebay , some have a fixed arm others adjustable .
I suggest you remove your original to check what the problem is first.
GeoffD
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