I believe the original jack for the Aceca, Ace, 2.6 Ace and Cobra for that matter is the Shelley 12DL model. A group of us AC owner’s from the other side of the pond (WCACOC) traded some e-mails on the subject of jacks a number of years ago. I’ve attached 4 pictures from those e-mails of Shelley jacks from 3 different owner’s cars one of which can attest to the Shelley 12DL as being original jack as he is the original owner of a 62 2.6 Ace (chime in Paul if you see this post). The jack with the tape measure next to it is from a 59 Aceca (thanks Greg), and the rusty one (shall I say slightly melted) is from my car a 55 Aceca - AEX521. Btw - My jack went through one of the California Wildfires that took out my storage locker…I’ll likely beadblast it and paint it as a memento. Notice that all the jacks have a number under the 12DL that closely corresponds to the year of car (54 for my car, 59 for the 59 Aceca, and 61 for the 62 2.6 Ace). I tried searching for a Shelley 12DL on line and gave up. I understand that when they come up for sale they can bring good money from the Cobra folks (over $500 US). My father said he used a scissors jack for all the years he drove my car (32 years), He said it was easier to use if one actually had to change a tire on the road.
FYI - The owner of the 62 2.6 Ace jack (Paul) is currently using a MGA Jack branded “6 INCH DL” (his original jack is missing some parts). I believe Paul said the MGA jack about ½” taller so it’s a slightly tighter fit, but very similar in style. Paul – can you chime in about how well your MGA jack works? I hope this helps.
Best Regards,
John