Reddit reviews Hubcentric Rings (Pack of 4) - 64.1mm ID to 66.1mm OD - Black Poly Carbon Plastic Hubrings Hub - Only Works on 64.1mm Vehicle Hubs and 66.1mm Wheel Centerbore - Compatible with Various Honda Acura
We found 2 Reddit comments about Hubcentric Rings (Pack of 4) - 64.1mm ID to 66.1mm OD - Black Poly Carbon Plastic Hubrings Hub - Only Works on 64.1mm Vehicle Hubs and 66.1mm Wheel Centerbore - Compatible with Various Honda Acura. Here are the top ones, ranked by their Reddit score.
StanceMagic Hub Centric Rings made of corrosion resistant polycarbonate plastic. These hubrings will reduce or eliminate vibrations caused by a gap between your aftermarket wheel's centerbore and your wheel hub. Having a gap will prevent your wheel from centering properly during installation, leading to vibrations.HUB RING INNER DIAMETER: 64.1mm (Your vehicle's hub lip diameter needs be this size)HUB RING OUTER DIAMETER: 66.1mm (Your wheel's center bore needs to be this size)Compatible With Acura 1997-2003 CL, 2006-2011 CSX, 2013-2019 ILX, 1997-2001 Integra Type R, 1986-1990 Legend, 2001-2019 MDX, 2016-2020 NSX, 2006-2020 RDX, 1995-2012 RL, 2014-2019 RLX, 2002-2006 RSX, 1995-2014 TL, 2015-2019 TLX, 2004-2014 TSX, 1992-1994 Vigor.Compatible With Honda 1990-2020 Accord, 2006-2020 Civic, 1997-2019 CR-V, 2011-2016 CR-Z, 2003-2011 Element, 2016-2020 HR-V, 2018-2019 Insight, 1995-2020 Odyssey, 2003-2020 Pilot, 1992-2001 Prelude, 2006-2014 Ridgeline, 2017-2020 Ridgeline. Also compatible with 1999-2006 Land Rover Freelander.
Would probably look better than it is now, but if you plan on buying those you need hubcentric rings to avoid vibration. The centerbore of those wheels is a tad different than the civic.
These will work
Scrapyards are a good place to look around, if you're just looking for something OEM-looking and don't mind some scuffs. The really flashy stuff is aftermarket and you just have to find what you like - tirerack or something, I suppose, to start with.
W/r/t sizing, I'd probably see what factory options were first, and use that as a sizing guide. Wheel-Size.com says that the Nismo edition shipped with 18x7" rims, so if you could find those somewhere that'd be a good place to start and you'd know it'd work.
To expand your search pool a bit, check out Honda Accord wheels. They shipped a bunch with optional 18x7.5" wheels about 10-15 years ago and scrapyards are full of 'em. They use the same bolt pattern and you'll need a 2mm (64.1mm -> 66.1mm) hub-centric ring spacer for the hub. They also have a slightly wider offset which should compensate for the wider wheel and prevent rubbing.
If you get bigger wheels you'd need different tires, of course, hopefully matching the outside diameter (so your speedometer/odometer aren't off). 215/40R18 would be the closest match and would work on either a 7" or 7.5" rim. If you did have the 7.5", you could go up to a 235/40R18. Which would be pretty grippy.
Useful:
https://tiresize.com/calculator/
https://www.tyresizecalculator.com/charts/tire-width-for-a-wheel-rim-size-chart
Or you could leave it stock, because they're probably fine as-is. But what's the fun in that. ;-)