Hi Tobin,
Mike's correct, the big end bearings are cast into the con-rods. If you strip the con-rods you might find a shim between the rod and the cap and removing this might help if they aren't too badly worn. Otherwise it's a 1930s-style re-metal job. The Morris book that Mike refers to is called "Repair Aids for Service Vehicles" and it's not much use other than for dimensions. It doesn't say anything about big ends. I can let you have a copy of parts of the C8 and C9 workshop manual which has a bit more information on big end work if you PM me an email address.
I suppose it might just be possible to machine the rods to take modern shell bearings.
We've had quite a lot of spares from Rolf but he told me that he's sold everything now. He didn't have any con-rods but I think he listed some of the main bearings.
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