28/29 rad shells compatibility

[JonE]

The AD shell was black painted steel and shorter between mid 1926 and September 1928 ,at this time  the magneto engine was superceded by the coil engine and the taller Nickel plated shell. The R saloon and RK saloon were produced together for a short time , both with nickel shells (till around late October 1928) to use up stock.
Cheers Steve Hainsworth

Thanks both

Steve - do I infer thus that those saloon nickels till Oct 28 were the same size as the pre Sept 28 AD? (i.e. Nickel is not a linking factor)

That's good to know the early shorter rad shell finishes when the magneto finishes. I presume the taller one is also that which Ruairidh refers to as the one that is used on the 65/Nippy.