Actually know the wheel's you're talking about, as a friend used to have a 91' LSC. These were RWD car's, so cafeful with the offset's, not to mention the added spacer's. This style wheel is considered quite dated and a bear to keep clean, so maybe why the cheap price. Also, how much do the spacer/adapter's cost. If you do end up cutting down your existing stud's and decide to later go back, then what. Know I certainly wouldn't go this route.
LOL...nothing is a bear to keep clean if your car is always clean....

Dirt is affraid of my car and doesnt come near it. The wagon can be show ready at anytime from April to October in less than 90 minutes, from roof to brake lines and everything in between.
The spacers are about less than $40 each. I dont want to cut my studs, becasue I do want to be able to use my stock rims in the winter, but that all depends on the fenders. If I had to I would sell off the stock rims and buy steels for winter in the new bolt pattern. The other option, if ever
needed to change back new studs could be pressed in. But if I went that route, there would be no need to change the studs.
What I would really like to do, but again parts issues, would be to re-drill the stud plates and stock brake rotors to the new bolt pattern and install new studs there. That would be a b!tch though if i ever need to change a rotor in an emergency while out of town.
There is still alot to look into with this before I folloow through with it.