The ornamental design for a mudguard for vehicles, as shown and described.
1. Mudguard for vehicles
Figure 1.1 is a perspective view of a mudguard for vehicles; figure 1.2 is a left view of a mudguard for vehicles; figure 1.3 is a right view of a mudguard for vehicles; figure 1.4 is a front view of a mudguard for vehicles; figure 1.5 is a back view of a mudguard for vehicles; figure 1.6 is a top view of a mudguard for vehicles; figure 1.7 is a bottom view of a mudguard for vehicles.