Thruxton Spacer To Replace Speedo Unit.(2005)

Hi all,
2005 Thruxton and looking to remove and swap out Speedo unit and go electronic. I have found a spacer in the UK....but postage is the killer. Has anyone done this mod or fabed up a spacer and has the measurements. I’ll go to a local machine shop and have one turned up. Many thanks.

http://www.britishracer.com/index.php?main_page=product_info&products_id=1441