Here we go:

The manufacturer in fact was Peter Monteverdi, his plant is located in Bale-Binningen in Switzerland. The base of the modification called Tiara was in fact the W 126. The Dodge Aspen was the basis for the Sierra, but I have no idea, why anybody on this planet wants to modify this fine piece of american engineering.

The Tiara looks, to put it that way, unconventional. In my opinion, the 375/4 is the much better looking car with four doors and a Hemi. The 375/4 looks like a Bitter and they both have a close resemplance to the Maserati Quattroporte. Bitter, by the way, build his cars on Opel cars, his plant was located in Schwelm in Germany close to the Ruhr valley (the bodywork was partly done by Michelotti in Italy, but that is a different story )

The most successful work of Monteverdi was the conversion of the Range Rover to a four door design. The conversion was available through Rover dealers.

Very successful also was the luxury SUV on International Harvester Scout. He never took the Patrol, the only work he did with japanese cars you don't even want to see...

Kind regards
Eberhard