Hi Neil,
Having read the thread on the suspension I see a familiar theme running that is probably encountered by many owners of older cars with discontinued parts such as ours. There simply isn't the demand for companies to re-make these items and it be cost effective. Like Eric I too have experience of Leda & GAZ Gold shocks for the Beta. Although these remade items are top quality, you pay through the nose for them. This often puts people off from the very start.
If you want "like new" items then IMO your pretty much resigned to collecting spares, like strut bodies, stripping them down yourself and having them shot blasted and powder coated yourself. Then rebuild and fit to car, performing the same thing on the set removed from the car. There are so few people doing what Beta parts that it's not cost effective, but restoring old cars is tantamount to standing at the side of the road shredding £20 notes.
Sure there are people out there that have New Old Stock selling on places like eBay, but the vast majority of the time they want top dollar for it. Occasionally good stuff comes along and if your lucky then you can get it at a half decent price. But its a waiting game and its something I do regularly because little gems do crop up! Alternatively, you buy an old wreck of a car and strip the vital components and store them.... something I've just done! Over time I refurbish parts, not only for myself but others I know with Betas.
I'm must highlight the fact that I am a NPO!! 
At best you might find another person or two who is after the same or similar job being done and you can club together. (I may well be doing all round standard shocks very soon) but for group buys or club buys, companies want to do minimum of sets of 10 at a time, as its more cost effective for them. All we can do is stockpile pairs of rear struts and get the good ones refurbished properly.
If we had say 6 - 10 (3 - 5 pairs) of rear strut bodies then it'd be cheaper to have them done, but return on covering costs would be very slow and that puts clubs off, when I come to do mine in the near future I'm resigned to them coming off the car and me stripping them down and having just that pair done. More expensive, but I do it because I love a project and I've learnt through doing several restorations on different cars that its pretty much what you have to do!
Have you looked at how much it would cost to strip and refurbish your existing set? Or is your car in use every day and you want to keep it on the road all the time.
Ultimately, my plan would be to have a pair of rear struts refurbished, sat on my shelf, when someone wanted them they exchange their old set for my refurbed ones and only pay the delta for the cost of refurbishing. I would have done it this time round, but my Ex-Pat mate who lives in Italy urgently wanted the pair I had, so I shipped them over to him (Coals to Newcastle eh!!)
So, I just have to find another pair of empty rear strut bodies now!
