You have a good question there. How would you replace them with something that matches? I don't know. I've never even heard of them and I know most all the arrows made. Don't think you'll find too many places that sell them.

Let's get to the crux of it. The 5065 designation is a way of determining spine within certain parameters. The numbers mean that the arrow is designed to be shot with bows ranging from 50lb to 65lbs. But that isn't all there is to it. Most carbon arrows are specified in some manner like this, but what some don't know is that this is with a 29" arrow. Depending on your drawlength and the length of the arrow you intend to shoot you can vary from this. In other words, say you are shooting a bow at 65lbs with a 31" arrow. You would be well advised to shoot the next heavier spined arrow to assure proper flight. If you shoot the same weight at 27" you might be able to shoot a slightly lighter spined arrow, although this one would work just fine. With any arrow, but especially carbons it's always better to err on the side of a little stiff than too limber.

If you plan to replace these in the future you could probably substitute with something like a Gold Tip 5575 or Beman?Easton ICS 400. Most likely what you have is an entry level arrow that isn't as straight as better quality, probably heavier than higher quality ones, too. A good place to start as we all have to start somewhere, but in the future I would recommend upgrading a bit. It's not necessary to buy the highest grade arrows, but something that is straight to within .003" would suffice--and midrange in price, say about $80/doz.

As you learn to shoot better and don't lose them you would be able to tell the difference between arrows of .003" starightness vs .006", but not necessarily .001" vs .003".

Hope this helps.