Another useful answer from Ferodo technical manager, Edward is a top notch guy! Hope you find it useful:
"Dear Tamas
The FERODO RACING range works as follows. We have an FCP (for stock calipers) or and FRP (for racing calipers) prefix before a number, and then the suffix identifies the material.
H = DS2500
R = DS3000
W = DS1.11
Z = DSUNO
This I confirm your identification
FCP1667R - DS3000
FCP1667H - DS2500
FCP1491H - DS2500
FCP1491R - DS3000
Another part of Federal-Mogul sells the normal aftermarket ranges. FDB is a prefix that the Ferodo Premier range uses. Thus FDB1491 is a good quality replacement pad. Should be about equal to the OE quality. But it is not a high performance or racing pad."
"Dear Tamas
The FERODO RACING range works as follows. We have an FCP (for stock calipers) or and FRP (for racing calipers) prefix before a number, and then the suffix identifies the material.
H = DS2500
R = DS3000
W = DS1.11
Z = DSUNO
This I confirm your identification
FCP1667R - DS3000
FCP1667H - DS2500
FCP1491H - DS2500
FCP1491R - DS3000
Another part of Federal-Mogul sells the normal aftermarket ranges. FDB is a prefix that the Ferodo Premier range uses. Thus FDB1491 is a good quality replacement pad. Should be about equal to the OE quality. But it is not a high performance or racing pad."