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The Lister Jaguar Special was also an Indy roadster type layout but I don't think it was ever entered for the Indianapolis 500. The 420 Eldorado Maserati roadster was actually entered for the 1959...

As best I've found, the best finishes of Italian marques in the Indy 500:

Maserati 1st
Fiat 2nd
Alfa Romeo 6th
Isotta Fraschini 17th
Ferrari 31st

Corrections welcome

It looks like three Ferraris were entered in the 1953 500 but none made it onto the track. Two were listed as of the 1952 type but one was powered by a 3 liter supercharged 500 hp V12 engine that...

Yes, that's why I said "car and engine". I believe Isotta-Fraschini also ran Indy in the early days but I don't remember where they ended up. Alfa Romeo provided engines in the 1980s and 90s as well...

Fiat actually has the second best record for Italian manufacturers (car and engine) at Indy, leading the race early and finishing second in 1912.

Alfa Romeo even had more success at Indy than Ferrari.

Hi D-Type:

Yes, I know that Indy ran under different rules but the displacement limit for normally aspirated engine cars was 4.5 liters from 1950-53 which was the same as F1; that was what I was...

Yes, Ascari finished 31st out of 33 in what was the only World Championship event in 1952 that was run under F1 rules. All the other WC GPs were run under F2 rules due to lack of F1 competition....