Pair of 5mm thick heat insulator base plates with gaskets.
DELLORTO DRLA 40 & 48
WEBER IDF 40, 44 & 48
WEBER IDA 48 2- barrel carburettors.
WEBER 40 3-barrel carburettors such as IDA3C, IDL3C, IDTP etc..
Other sizes of the above carburettors might also be able to use these gaskets but some gasket modification might be required, to avoid airflow interruption.
These act as mounting gaskets + heat insulators.
Stud hole centres are approximately 79mm apart.