2001 Montana - What should be the length of the passenger's windshield wiper?

I've had this problem for a while where my wipers catch on each other and then get twisted. I've tried adjusting their off position with no luck. I just changed the whole assembly thinking the motor or linkage was worn out. Problem still happens. I noticed that after I ran the wipers and then turned them off, the passenger side was not resting against it's bumper. It was stuck on the molding around the bottom of the windshield. The edges of the wiper appear to be ~1/2" too long on each end and catch. I measured the wiper length and its 24". The same wiper on my 2003 montana is 23" long. I checked the web and the wiper is spec'd at 24".

Has anyone else run into this problem and found the work-around?
Thx.