Sierra rear wheel bearing housings, how easy to make?

[Bonzo]

I have used a company called Bearing Services LTD ( BSL ltd )

They are a national chain & more often than not come up trumphs for obscure bearings.

As Ash has said, it is well woth measuring the OD & length of a bearing, then finding out if one with a smaller or larger ID is available.

Folk probably know this but the numbers etched onto the face of a bearing usually contain the type & size of the bearing

Bearing supplyers are also a good source for oil & grease seals, again the numbers on them are often the type & size