Garf,
I've not personally used an anchorage but I do have an otter skin which is great, I suppose if a weekend up here is out of the question the next thing to do is give Divers warehouse a call, they maybe able to sort something out for you (stock sizes or something). I don't know the guys name (think it's something like JJ) but the customer service is second to none I believe.
Sorry I can't be more helpful
