Singlespeed & Fixed Gear - rear hub spacing

So the other day the locknut/spacers on my rear hub snapped when i was tightning the lockbolts down, and i got some used spacers that kind of fit, but are a bit wider than the last set. now, when i put on my rear wheel, the hub pushes the dropouts apart maybe a half centimeter or so. is this terrible to ride/use the bike in this condition? i just couldn't find the right kind of spacers to keep the same exact spacing that it had before.

any input is appreciated. thanks

as long as it's steel, it'll be fine.

half centimeter?

that's a pretty big difference. Your frame is fine if it's steel, but if the 5mm is all on one side of the hub, you've moved your chainline by about 2.5mm. You might want to take a look at that.

it is a steel frame (double butted though.) it's pretty equal on both sides, and chainline did change a bit (not in my favor) but it is still OK (tolerable)

Use some freakin' junk washers, get that thing the right size. Like its been said, you won't hurt anything by riding it that way, but if it were me it would drive me nuts. The more accurately you have your wheel spaced out, the better your bike will track and the better your chainline will be.
Or just buy a spacer, they cost chump change.

If you are friends with somebody who has a bench grinder, you could just take off 2.5mm from each spacer. Time consuming and tedious, but free, and CUSTOM.