John Deere G Series Skid Steer windows Polycarbonate & Tempered Glass (small frame)G series: 312GR, 314G, 326GR, 317G, 318G Doors: Tempered glass is common but prone to breaking. 1 4" is a good replacement for glass. 250x stonger than glass 1 2" is recommended for all mowing, mulching and forestry operations You do not need to buy new hardware to buy the 1 2" door; it is routered down to the correct thickness to fit all of your existing OEM hardware. Skylight & Rear: 1 4" is OEM thickness. Location Dimensions OEM# Replacement Front