Researched this when I had a vit.on the cheap.Use rover 600 rear springs with astra mk1 shocks for the back and merc w123 springs with 2" strut spacers.You can get spring spacers from bits4vits or other dealers.all this info is available here in different postings in suzuki,you just have to trawl back.Had a mate who did the 2" lift and left the front struts standard.I got a sportrak now £65 for rear shackles and adjustable tosion on the front,Be different.