Your search for "Plug Cap" revealed the following:
Lambretta Stand Feet in Black 5057020 8007300
$20.99Lambretta black stand feet and roll pins 1 Pair INNOCENTI 150570208007300 Stand Foot Piedino Rubber Cap Protection Gummifuss...
Lambretta black stand feet and roll pins 1 Pair INNOCENTI 150570208007300 Stand Foot Piedino Rubber Cap Protection Gummifuss...