What is the bes way to attach the spacers to the new cabinets I have purchased ? Should I glue them to the cabinets or should I just put two screws at the top and two screws at the botton of each spacer --- two on each side naturally --- ?
Thanks Golfer 156:)

Drill through the styles of the adjoining cabinets,countersink the screw heads,clamp the spacer(if possible,remove the doors which might be in the way,clamping is important!)

Slowly screw the piece in,remember, most spacers are hardwood(and if painted, its probably not the most desirable wood to begin with... knots,etc)

If you over tighten the screws, they'll break off and you get to do it again... :)

Hope this helps,

Ken