Grim Reaper Replacement Blades?

I have grim reaper broadheads and need replacement blades. I don't remember what grain they are. I'm pretty sure they are the crossbow ones. I use them on my crossbow and wouldn't have bought the others. I have one left that's still good.

Can I use any grain crossbow replacement blades?
How can I figure out what grain they are?
Can I weigh the entire broadhead on a digital scale in grains?

I just read on Grim Reapers website that you can't use different grains on the same broadhead.

So is the 100grain the entire weight of the broadhead?

Yes the weight will be the whole broadhead . If your blades aren't damaged just resharpen them.

My other two broadheas the blades broke off. Missed my target and hit my fence.

Thanks. I'll weigh them on my scale.

No need to use them to practice and dull them. They fly like field points.

Thanks.