Ruger MKI old style magazines

One of the guys I shoot with is looking for some Ruger MKI magazines, (I guess there are two different versions of the MKI mags?), or a reliable way to modify later model magazines to fit his gun. We can swap the follower button to the other side, but the newer mags hit the bottom of his reciever and the feed lips are shaped differently. Does anyone have a cure or source for the old mags?

-Steve

Ruger still makes mags for the Mark I. They've changed the design of the feed lips, but I've been using one for a while now with no problems. Got it from Midway. Unfortunately, like a lot of things on Midway,they are on back order right now.
But, I did just picked up a second one at a local shop.