Since no one has answered your question yet, I'll take a stab at it.
I have not used the stripper clip option on any of my Mausers since the late 60's or early 70's. The system works really slick and fast, but there just isn't much need for fast reloading where I live in the Mid West. If one were a soldier carrying a bandalier of ammo all set up in stripper clips, it really would be the ticket.
When I was using them, I had an FN Mauser of Peruvian origin that had been converted to 30/06, a combination I have always liked. The ammo we were using back then was supplus U.S. 30/06 and the stripper clips were really made of the '03 Springfield. It did not make any difference, though, because most of these stripper clips are the same.
The head size of all cartridges made by Paul Mauser and the whole 30/06 and .308 Winchester family of cartridges are all the same: .473". The stripper clips made of any of the Mauser cartriges or the U.S. rounds will in all probability work just fine in your .308 Win. Masuer. In fact, the U.S. government paid Paul Mauser a royalty payment to use his stripper clip system way back when the Army designed the '03 Springfield, so we didn't have to come up with some inferior way to get around his brilliant and simple invention.
The only place you might go wrong is if you got a hold on some clips made for the British or the Russian rimmed cartridges. I can only guess that these would not work in a Mauser. The 6.5 Swedish Mauser was designed by the Swedes and is just a bit bigger at the base than the U.S. and German rounds, but I wouldn't be too surprised if clips made for these worked just fine in most Masuers despite thsi fact. The stripper clip system depends on good fit of clip to rifle, but it is not overly delicate in this regard.
So the bottom line is that you can use just about any of stripper clips you see advertized in the gun sales magazines (Shotgun News, Gun List, etc). And if for some bizare reason one type of clip does not work out right, it won't be any big loss as they are cheap. When you order them you will think they are cheap, when you see how simple and flimsy they really are, you will wonder why you paid so much for them.
So just buy a minimum number at first to see if they really work and if you really feel like loading this way.
Everybody who has Mausers or Springfields should try a few of these out at least once: this was originally one of the major selling points of these rifles and it really does work impressively.