40mm spacers you speak of are probably hub centric and they are about $300 for all four.
When you put them on the front did you let the car down? When I put my wheels on the tires rubbed the shocks until I let the car down off the jack. What is the offset on the wheels you bought?

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R