Hello I just bought some RPF1S 17x8 for my celiac gt and want some spacers to stick my tires even with fender,anybody have any size suggestion for the spacers?

What's the offset on the wheels? Just go outside with a ruler and measure the distance from the tire to the fender and there's your answer.

Im guessing his offset is +48
Im also having a wheel offset issue, im using gt4 calipers and my wheels are
5zigens fno1r-c
17x8 +48 and obviously it doesnt clear the caliper, was wondering if someone had a rough estimate of what size spacers i would need?
I have. 8mm spacers that im going to test out with these calipers.
So i will be around +40 offset. Does anyone know if i would also need extended lug nuts? It would save me the trouble without checking

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I'm hoping you got the lowest offset possible in 17x8 which is +35. If so. I'd say run 20mm in the front and 30mm in the rear with 205/40/17 tires. I know those are big spacers but if you want flush with your current wheels then you'll need these fat spacers. Lol. If you have the +45 offset then just do 30mm in front and 40 in the rear.