When my Bullers had to go to the great bush track in the sky, I replaced them with Ashleys, after finding as you have that Bullers are no longer being made. Figured I would just use them as is and chop them if the need arose, >3 years in, mine remain factory original. One thing I haven't done is melt the holes in the arch like with the Bullers, being taller, they just don't get wet so often as the Bullers didor. For as often as there is an overflow, I just tip them out.
As Micky says, try the Farmlands, PGG etc.
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