I'm uncertain of the length of the captive bolts on the vitara but if they are the same length as the Escudo then you have two options easyist is to cut out an access hole in the floor and shove a grinder in and grind the head off the bolts so you can replce them with bolts (I've done this on one escudo usign a plasma worked a treat but the truck is a bit of a roughy)
The other option is get some special bolts made up that allow you to put your spacer block up on the body with the rubbers where they are spose to be... the special bolt is hollow and threads onto the captive body bolt

to fit this bigger bolt you pull the plastic insert out of the upper rubber and drill the bottom one and its washer, at the time we were doing Weemsy's truck I gave up on this becouse of the cost of the calmini kit, after seeing how cheap and nasty the kit is I wish I had done this
The cheapist option is the just over 3" lift setup you are running in the pic above all you need to finish it is some collets to fit in the chassi outrigger hole to locate it and some hd washers
Cheers Reece