Its something which could be easily made from stainless rod and rose joints like Marty said. Its much easier to replicate the rear one as it just bolts to the lower arm, rather than the front one with its silly clip.
A pair of
these:
A bit of threaded rod, and a chunk of right angle aluminium should be all you need. Designing a long-term solution to these parts (and the wiper linkage) is on my to-do list
