Hi Larry! Not positive but a stock Pantera booster may be the best bet...the basic dimensions match and they both mount with a three stud pattern (non-equilateral triangle). I'm not sure the triangle patterns are identical between deTomaso models but would be surprised if they weren't. Also not sure about clocking of the vacuum inlet fitting - the 'other' main worry imo. The 3-stud boosters only go in one way so that determines how the booster hose is clocked. The first image shows a Mangusta booster on the right and 2 Pantera boosters....you can see bulges for the vaccuum fittings on two of them, and the gereral orientation looks the same. So they might be clocked the same Anyone gone down this route before?!
Second photo shows a Pantera booster and the 70s style Ferrari part Lee mentioned. Besides the mounting issue the Ferrari parts are about 20mm larger in diameter and must use a different sized bladder (circumferences c. 630 & 700mm, respectively, body depth for either is ~160mm). If any Ferraris ever used a 3-stud booster it COULD be an early Dino (....expensive unicorn of a different color). Fiat Dinos are a possibility but the one poor photo I have suggests a 4-stud design. No real idea about Lancia, Alfa or other Fiat alternatives but never seen anything that looked very promising!
