Mine were completely rusted away on both sides. I did a bit of measuring and head scratching before removing the bulkhead: they're 2" 'U' channel, and I'm planning to fabricate something to do the job.
Thinking Sammio style, ie, completely off the wall, how about a bit of 2"x2" timber cut to length, suitably treated with Cuprinol and bolted in. Anyone tell me why that would'nt work?