I’m changing from the stock struts to fortune coilovers. My front lower strut bolt was seized which I saw A thread about as a pretty common problem. While getting it out I managed to round the head. Where can I find a replacement for this bolt? I’m not having any luck online.

 

Use this diagram, the bolt is there. You can order it online from various places or at your local dealer: https://www.lexussouthatlantaparts.c...&searchString=

Part # 90105-14153

Otherwise, I can imagine you can take it to a Home Depot/Lowes/Fastenal/whatever and find something similar. I want to say it's an M14 at the very least.

 

In the future, use 6 point sockets and you won't strip the heads like that.

 

Don't forget your local Lexus dealer might have one or two in stock. Just a phone call away.

 

I think this is a common problem because people forget to unload the suspension causing unnecessary tension on the bolt during removal.

to do this right, make sure to lift both left and right wheels off the ground, not just one side, even if working on one side of the car.
the sway bar keeps tension on the suspension if only one side is lifted off the ground.

 

If the bolt is torqued correctly, it will have been torqued to spec while the suspension is loaded at ride height - meaning there should be more "load" on the bolt if the suspension is unloaded.

However, I think any load on this bolt from the suspension cycling is minimal compared to the torque value on the bolt. It is close to the ground, and things tend to corrode in place over time.

OP - I did this same operation several months back, and I had replacement hardware for almost every bolt I took out before I started the operation. I've got a list of part numbers if you need any additional hardware.