Rear Axle Bushes - Bristol 410

[AndrewA]

Car is going in to have rear axle looked at and at the same time I thought I'd take the opportunity to renew all the bushes - which are looking a bit tired.
I’ve sourced new bushes for all the watts linkage and surrounding areas but am struggling to find the ones at either end of the axle – the big top hat ones. The usual specialists have them on back order at the moment - so could be weeks - might be months.
I understand some owners have had success making up their own - and looking at the polybush catalogue there seem to be some there that might be a good starting point at least. But from experience I know that polybushes can be a bit harsh - depending on where they're used.

Be grateful for any received wisdom.
Thanks
Andrew