Hi guys looking for some advice if ya can help!

Recently purchased a white mk4 van and am gonna lower her on some 17's to start off with. Heres the thing, i've been offered some 17in kahn rs-r's with new tyres at a very reasonable price only thing is they are an et-35 offset! Will these fit without any probs or can i use spacers if i need to? I am intending to lower the van about 40mm as the state of the roads up north in scotland are f@*king terrible! i've been advised that all estate suspension is compatible so am gonna order up a kit!
Any advice much appreciated,