Ibanez btb 556 pickups

Hi all!
Seven years ago, i replaced the Active preamp in my btb with a passive electronic. It sounds good at time, but now It feels very sloppy and soft (in an ugly way....).
I was wondering if the Ibanez pickups should be replaced... But without spending a lot.
The problem is the size of the pickups: 113*33 mm with 3 screw. I cannot find any of that size
Anyway, here a Little pic of the "new" electronic.

Thank you in advance for the help and sorry for my english

 

Anyone? :/