For sale on ebay at https://www.ebay.co.uk/mys/active
Full details thereon. I apologise for the asking price, but they went through several iterations to get right and I'd like to recoup some of the money spent doing so, however they may be "just the ticket" for one of you...? The auction is for a pair of sights, so if you only need one you can buy one and sell t'other?
PS: 'hope it's not against the rules here to advertise a sale on ebay thus - if it is, my apologies, please delete post if so and I'll not repeat.