I bought a few sets of rears from
this eBay listing and can confirm they work very well indeed on a BJ4 (non-WE). It was murder getting a set of new Schumacher yellow full-spikes on, but the fit was so tight, I didn't need to glue them (for polished wood with the odd scrap of carpet at the jumps).
Unfortunately, I was unable to find fronts to match, with that trader or anywhere
