Rich, very good chance that a previous owner installed shorter wiper blades. As Joseph stated, as long as you have the clearance the sky is the limit. BTW, mine currently has 20" blades but I'm pretty sure that they would take 23" without a problem.
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Jon & Chris Everton
1986 40' Dog House #86
0 hp 8V92 Allison HT740
Soon to be 500hp ISM with ZF 6 Speed
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