I bought them direct from Rink in Germany
www.pistol-grips.net
They have an online ordering service and are very reasonable to deal with there response to me emailing questions was rapid, almost bt return..no time to go and make a coffee, it was that quick and any of my questions however simple the answer might have been they always took time to explain.
Turn around from time of order to delivery was about 4 weeks that included their 2 week holiday
Hope this helps
Iain