I found this on the S2C forum, theres quite a bit about it on there, but what it boils down to is a chap is making them.
Quote: At the risk of boring LRM readers, who've already seen it, there's an article in the latest issue about this guy who's got this cottage industry going producing galvanised Series bulkheads.
Far from being a bodge to keep a banger on the road, they look pretty well made and this guy seems to be pretty clued up with his engineering skills. I'd be happy to have one of his 2/2a types sitting on a nice new Richard's chassis. Prices are apparently £650 for a S3 and £750 for a S2. Expensive, but then again I've seen Craddocks advertising genuine LR series 3 bulkheads for £998 IIRC - and they're not galvanised. :end Qoute.
Theres also this picture
I can not find his address or contact details, for that find a copy of LRM which as the article in.