Fabric Joint Propshaft Lengths

[DavidK]

Measured the propshaft from my 1931 RM Box (should be BP93) it is 19.5 ins.

David many thanks and interesting.  I presume you have a 3 sheen box, which axle do you have on your car?

Thanks

Yes, 3-speed gearbox and 4.9 banjo rear axle.
Looking at the Part's Lists BP73 has all the same fitments but slightly different profile at both ends.
BP73 appears rounder, in the picture, at the carden end. Being the same length is not surprising as gearbox and rear axle are almost identical. I also have a BP73 somewhere, i will get it out and compare more accurately.