New Holland Deluxe Series Skid Steer Door.  Fits models: C175, C185, C190, L160, L175, L180, L185, L190, LS160, LS185.B, LS190, LS190.B, LT185.B, LT195.B. 

Available in 1/4" and 1/2" thick abrasion resistant polycarbonate. 

Often referred to as demo doors or forestry doors.  These shatterproof polycarbonate doors are 260 times stronger than glass of a comparable thickness at half the weight.  They are formed to fit the same as your OE window did.  They are cooler in the summer, and warmer in the winter.  They let through less sound than glass and most importantly keep you safer and you have less down time because you don’t have to replace broken glass windows anymore.  

1/4" is a good replacement for glass.

1/2" is recommended for all mowing, mulching and forestry operations