After reading about sabrerallye and his hillclimbing exploits using a CG lock to help with seat positioning and having done a track day myself where sliding around becomes a big issue I have arranged a group buy for these. £36 is what they will cost, maybe less, including postage. They are normally £50 from producers or £40 from Demon Tweeks which is the cheapest I can find. There is no minimum buy though they would like at least 20. More than that and the price should drop further. I think you order direct through them with a discount code. More details to come as I get them. Please express any interest below.