I've been getting play in my headset, no matter how much I tighten it.. after a bumpy ride I get the play after 2 days again. I think it was because of my initial installation, tightening the top cap too much when I first got the bike. So I decided to try to replace the bearings. When I disassembled everything, the bottom bearing shows TH Industries 1.5" 36x45 exactly like this

FSA 1 5 Cartridge Standard Bicycle Headset Bearing 36x45 MR110 160 6740 | eBay

There is no mark on the top bearing, so is it safe to assume it is 1 1/8 and also 36x45? Any help would be appreciated, thanks.

edit: Bike is a Jamis Icon pro, on manual it says 1 1/8-1.5" tapered head tube. I'm concerned if 36x45 is the right angle for the top bearing, just want to make sure.

One would hope that both top and bottom bearing cartridges were of the same fit family, if not the same diameter. But is it "safe" to assume so? Sure as the only risk is money. It the angles are not correct the you'll be back to a hard to adjust headset and only out a few $. But there's a way to measure first. The best way is to use a headset gage which measures diameters and angles of the seats and bearings. Most better shops have one. Andy.

Of course, derf.. I was so worried about damage that I completely brain farted while messing about. Obviously it would be noticeable since i would still get the headset play.. For couple bucks its worth a try. Thanks Andy for the info on the gauge as well, much appreciated!