wheels will they fit my 90 2+2

I am new to the 300zx, I have a 1990 that I would like to put new wheels on. I found a set of wheels that are 17x9 5x100 5x114.3 +35 in size. The dealer tells me that "These will bolt on to your 300ZX but will be a very wide wheel for the vehicle so some modifications may be required. It should be a pretty close fitment."

Not quite sure what this means, will they fit or not? What modifications are they referring to? What do they mean by close fitment?

Specifications
Wheel Diameter 17"
Wheel Width 9"
Color Chromium Black
Bolt Pattern 5-100/5-114.3
Lip Size 2.75"
Offset +35mm
Backspacing 6.38"
Centerbore 73.1mm

Thanks,  Dave