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Hi Greg,
This might help. Most of mine are from the second one: 20*10*2.5*4 and you can stretch them or glue them if the rim diameters are a little bigger or smaller (at least for urethanes), so long as the ridge (groove) isn't bigger.
Source: Wayne69's waspslot site
Chris
This might help. Most of mine are from the second one: 20*10*2.5*4 and you can stretch them or glue them if the rim diameters are a little bigger or smaller (at least for urethanes), so long as the ridge (groove) isn't bigger.

Source: Wayne69's waspslot site
Chris