Ultra Racing suspension and vehicel body struts to improve drive performance and safety 3-Point Rear Lower Brace for Jaguar XK8 4.0 98+ High-strength strut for stiffening the car body and the suspension Ultra Racing suspension and vehicel body struts to improve drive performance and safety 3-Point Rear Lower Brace Vehicle manufacturer: Jaguar Model: XK8 4.0 98+ Are dome struts / wishbone struts subject to registration? We contacted Tune it Safe on this subject and received the following information: If struts and/or stabilisers are screwed to standard fixing points, they are not subject to registration. But this does not mean that all police officers know this. Our recommendation: In order not to let such discussions arise, have them registered.