thats not that bad, found another one HONDA CBR 1000 RR GPMS BARRY WARD SWING ARM HRC KENNY ROBERTS | eBay this one is a lot nicer IMO
The arm requires a specially developed shock to suit the "top hat" linkage. Usually they were WP with the gas reservoir slung underneath. Harris would no doubt adapt an Ohlins however. These were used by Honda Uk on the Red Bull Rea bike. They were £5k at the time. The KR (Kenny Roberts ) Barry Ward, now GPMS arms for the 04/07 Blades, (used by PBM for the Stobart bikes) used conventional Kit HRC and Ohlins Shocks. These were allegedly over £10k when in fashion.
Not quite 10k.... The GPMS arms are roughly 2.5k, not so much Milling on them as the Harris items, but a little more bracing. Both are good but most are going back to the HRC kit item now.
If you can find one at that price please buy it and I will give you a premium ! You have no chance. None at all ! And the front runners in BSB are all on GPMS, FTR or occasionaly Harris arm.