Hi All, yes they are from Mackay rubber .com and I bought 2 x 300mm lengths of the lighter ones and they cost me just under $300AU which I thought was right up there but looking at what Bob linked to Ebay they're about the same. That equates them to about $15AU each. I did consider making some after seeing Richards Arial bases but this was much quicker and they are the same as the originals.
Hope this helps.
Colin.
