Your Jensen VR1825VWIN was specifically manufactured for Winnebago by Jensen. This is obsolete and you will need to replace it with one like the Jensen RV Stereo # JWM45. The VR1825VWIN has a cutout opening requirement of 7.2" wide by 3.7" tall. The # JWM45 has a cutout requirement of 7.06" wide by 3.375" so you will not have to enlarge the opening. view full answer...