Copy position from one object to another on one axis

Hi! I'm building simple game where planet is shrinking as car drives on it. (inspired by Brackey game Shrinking Planet) Long story short, main point is to avoid meteor craters. My question is how to get craters Y axis position the same as players Y axis position. I'm using prefab to randomly spawn meteors and craters, the meteor always has one crater that is on its impact position(X and Z) but now I only need to set Y position so its always on planets surface. If you help, Thank you! (And if you only read this, thanks again)