Hey everyone, I'm looking to purchase some Work HS203 wheels for my 2015 IS250. I was wondering if I have to do some modifications to the fenders to make it fit. The wheels are 19x9 +30 in the front and 19x10 +30 in the rear. I am currently on stock suspension but plan to upgrade to coilovers in the future.

 

Welcome to the forum!

The front may or may not pose some rubbing depending how low you go and what size tire you choose.
At stock height you should be fine.

The rear offset is very low unfortunately and will cause rubbing for sure.
For a 19x10 on the rear you would need an offset around +42 to +45.

 

so even with rolling the fenders in the rear,, it still may rub? Once I move to coilovers, I just plan on closing the gap so nothing insane.

 

When you're at your vehicle next grab around the edge of the rear fender...it's actually factory rolled...there is literally nothing left to roll...literally nothing.
The front could be rolled a little.

The give you some idea about clearance...with RSR Downs in the rear, the tire to fender gap is pretty much gone and typically 19x9.5 +38 could be used without any rubbing...including up to a 265/30/19 tire.
Some have tried 19x9.5 +35 and have reported some rubbing depending on tire size/brand and vehicle load.
Now translate that to a 19x10 +10...you'd have to camber the wheels and run a super stretched tire for any chance of clearing the fender.
The other option is stretching the fender and getting it bodyworked so the wheel clears...which means painting the rear quarters at least.