BMC and Austin parts numbers often didn't change if the effective function
and mounting didn't change. In the case with the switch, I believe the
only difference is the length of the knob.
For my '51 Austin Atlantic, in one or two instances it uses the same part
number for a 1/4" BSF bolt and a 1/4" UNF bolt, and the only way you would
know the difference is to look in the parts book where it actually
specifies 1/4" UNF bolt in the parts description , just for that one use of
the part number.
Of course, I always defer to John Harper on this type of thing!
Best,
Alan
On Tue, Mar 19, 2013 at 2:13 PM, <fiat500f@aol.com> wrote:
> Hmm. I was looking at a Lucas site today and found something that
> conflicts
> with the factory parts books. Concerning the battery kill/isolation
> switch in
> the boot. The Lucas book/site says that it's Lucas number 76605 for BN1,
> BN2,
> and BN4 (1957 only), then after that, the cars use 76604. In the BN1/2
> parts
> book, it says the switch is factory number 1B2804, but I noticed that in
> the
> factory BN7/BT7 book, it's ALSO listed as 1B2804. So Lucas says the switch
> changes, but the factory says it doesn't? I know the switch are very
> similar,
> but, they are different. But no later part number change by the factory.
> Yeah, yeah, it's Healey minutiae, but, I was wonderin'.... :)
>
> - Paul B.
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