Hey there, installation of the strut spacers was a major pain in the a$$. The bolt holes on the front spacers weren't even close to lining up so I had to do a lot of !Removed! around to get them installed properly. The rear ones went in OK but I have a lot of squeaks and rattles from back there. Finding someone to do a wheel alignment was difficult because as soon as you're not playing with the factory specs, they want nothing to do with it. Once I found a shop willing to do it, the handling improved dramatically. As far as the Lexus ride is concerned, I drove around on the lift for a few weeks before I got the wheel spacers and off road tires installed. When it was just the lift kit, the ride was pretty close to exactly the same as before. Add the big off road tires and it feels like an F-150 instead of an RX300 but that's to be expected.
The strut spacers came from "mother Russia" and shipping took FOREVER... Like 6 months. Probably had a lot to do with the fact that all the COVID stuff had just started so might not be as bad now. If I had it to do over again, I'd have gone with the other lift kit that someone posted earlier in this topic (the blue metal kit). Way more money, but way better quality... Anyhow, here's the link to the strut spacers and wheel spacers. Both are on ebay.
Complete Lift Kit 40mm for Lexus RX300 RX330 RX350 RX400H | eBay
4 pc Wheel Spacers 2" 5x4.5 Adapters bolt 12x1.5 5x114.3 Fits LEXUS 5 lug bolt | eBay