<p>This is from Charles Nicholls of the Vintage Lamborghini Garage:</p><p>The lockheed unit fitted to my car by previous owner is a LE110117 with LR18221 servo, 3.00:1 boost ratio, 5/8" slave cyl bore, 5/16" reaction piston bore. Major svc kit is LK11062, air valve LK11032</p><p>It is listed as fitting:</p><p>Alfas: 1750 Berlina GT, Saloon, Spider Veloce & Coupe, Veloce A12 & F12 Commercial.</p><p>Alvis: 3 litre (drum brakes only) (!)</p><p>Aston Martin: Lagonda 2.5 litre Mks. I & II and 3 litre</p><p>Autin Healey: 2.4 C type, D Type & 3000</p><p>Bristol: 400, 401, 402, 403 & 405</p><p>Dennis: F.D.4 Ambulance</p><p>Jaguar: XK 12 Mks I & II XK 120c XK 140 XK 150</p><p>There is also a Girling x-ref as follows: Girling Lockheed 64049354 LE10117 64049126 " 64049460 " 64049408 " 64049354 " 64049126 "</p><p>So that should give some search capability against the various marques on the internet.</p><p>Charles</p><p>Forgot the obvious. The Girling unit we use was, I believe, designed for the Austin Healy (3000?) -- so Moss Motors would be a good source for the Lockheeds. </p><p> http://www.mossmotors.com/</p><p>In fact, in their downloadable AH catalog (no, not Adolph Hitler), they list:</p><p>*Note: Original Girling servos have not been available for many years. </p><p>Replacement Lockheed servo units are available ( bracket set is required to install servo): A 981-173 $665.95 SERVO ASSEMBLY, Lockheed replacement 1 021-173 $65.95 REPAIR KIT, Lockheed servo 1 B 021-489 $95.95 BRACKET SET, Lockheed servo - req'd. to mount servo</p>