Bear "It's all about having fun."
I have the random stone one. Should be the same size. Center section(without "wings") 1 5/8" wide x 1 1/4" tall. Culvert hole-1" wide x 3/4" high. Wings are 1 1/4" tall x 1" wide. I personally think these look too big for HO. (big enough to drive a car through)
The N gauge is 1" wide and 3/4" tall. (without wings) These look better for HO.