bellbox compatability (maplin LS5000)?

I have just purchased and semi installed a maplin wireless LS5000 intruder alarm, having replaced it from a Fox Security FSS7500.Having re-decorated the house I am reluctant to remove the existing wiring to the outside alarm(4 strand wire, colours red,green,black and yellow) Would it be possible to use the old siren with the LS5000 and if so which terminals would be used for which colour wire?The possible connections in the LS5000 are
+ve set rxtx +ext LS stbbell trigger bell tamp

I would be very greatful if you could find an answer to my problem as I don't relish the thought of ripping up newly laid laminate floor and re-plastering. Thanks for your help

stuart oxley
June 2009