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If I do try to find a replacement, where should I be looking? Do standard K98 stocks for the M48?
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The Yugo M24, M24/47, and M48 use the same handguard. Unfortunately, I don't know of any place with them in stock. Keep an eye on eBay and Gunbroker.
The handguard from a K98 will not fit. As you can see, the handguards are quite different. The Yugo Mausers' handguard wraps all the way around the rear sight, up to the receiver, and is clipped directly to the barrel. A K98's handguard just extends from the front of the rear sight, and is held in place with a retainer on the front of the rear sight along with the rear barrel band.
(M48 on top, K98 on bottom)
A Vz. 24 handguard is similar, but the dimensions are different. It will fit on the rifle, but it won't look right, and the rear barrel band won't fit flush: