Try Stu Hoy at Anglia Sailplanes.
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I think he can make them.
TBH Scheibe might also supply them at a price but I think the T61 is Imperial measurements not Metric so might need a bit of fettling to fit.
Or make your own - the outrigger is just a length of 3/4" nylon round bar................... They do need to be rigid though - soft bar soon bends.......................
Arc