Rezlo, the best advice I can give you regarding lowering blocks is to make yourself a set. Your only challenge will be the thickness.
Let me explain, you will need a piece of metal or alu, lets say 20mm thick x 50mm wide and more or less 105mm long. The one side needs a 14mm hole to locate on the leaf pack center bolt and 8mm bolt on the on the other side to locate in the shock mounts hole that fits under the leaf pack with the u bolts.
What I will do to make a 20mm lowering block, take a 20mm piece of steel, drill a 8.5mm hole in the center, thru the entire piece of metal. then a 14 mm hole only 15mm deep into the piece of metal. Put a 8mm bolt thru it and fasten it with a nut, this way you have the hole to locate to the leaf pack and the bolt to locate the shock mount.
Here is a pic of a 50mm lowering block I made of 50mmx3mm square tubing, I just welded the side close to add more strength to it:
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http://www.race-tech.co.za/gallery/main.php?g2_itemId=686]
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http://www.race-tech.co.za/gallery/main.php?g2_itemId=688]
Down in Cape Town I will phone Saaymans Spring works for U bolts, expect to pay +- R100 bucks for 4.
http://www.saaymansspringworks.co.za/But any shop that can make springs is suppose to be able to sort you out.
I'll the photos tomorrow, have crap with proxy servers and photo uploading again.