mate,
which 4port caliper brend you're interested ?
brembo ? R33 stock or else ?
i'll need to know what and how you want it to be.
perdana runs on PCD 114, should give problem for installation, but i'm still have to get confirmation form the mech on exact part.
this set are made for wira and satria which runs on PCD 100, is not for perdana. modification needed to be done if this set installed on perdana and cost invloved.