Stanley Arnolt was an importer of European cars and based in Chicago and had previous form for taking some of these and having a bespoke bodies built for them in collaboration with Bertone, such as the MG TD and Aston DB2both of which sold in small numbers. The Bristol though was to be different, from the start he had negotiated to buy 200 Bristol 404 chassis and 1971 cc, six-cylinder 130 hp engines. The tall engine resulted in the bonnet air scoop being needed.
This car though had eyes on competition racing finishing well first, second and fourth at the 1955 Sebring 12 hour race and followed that up in 1956 with a second and third. So it was no surprise that the car was offered in four option levels, Competition (stripped out full on racer spec), Bolide (not a stripped out but non the less a racer), Delux (came with luxuries such as side windows and convertible roof, instrument binnacle and glve box) and finally Coupe (with pop up lights).
In total from 1953 until 1959 a 142 cars were sold of which only one was right hand drive and two had all aluminium bodies. Also one never received a body and was used to showcase the chassis and drive train at auto shows. The Wikipedia page link at the bottom goes into much more detail and I recommend you take a look.
The Bristol 404-
The Arnolt Bristol-
For more information-