the internat stuff i believe is different between the b and d series for that mount.

when you go rid of the rubber did water or liquid come out of the mount?

if you drill into the rubber of b series mount. there is liquid in there. i don't think the d series are the same in that sense. i could be wrong.

also. i thought the d series mounts only had 2 holes for the studs coming up and no third hole for the bolt going down. the d series had all 3 holes?