This crossing is a weird one. There is a mix of old and new. The right signal has a triangle gate with 8" lights while the left signal is 12"x20" with typical style gates. The 12"x20" has the only bell, the 8" has none.

Google Street View shows that all lights are now 12"x24" lights, and the mecahnical bell is now a WCH electronic bell.

http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Gross+Rd.+Mesquite,+TX&sll=37.579413,-95.712891&sspn=36.503847,56.601563&ie=UTF8&ll=32.768999,-96.612729&spn=0.004763,0.010986&z=17&layer=c&cbll=32.769092,-96.612729&panoid=ZpuXo9tfPXvfLpT9RVhz2A&cbp=12,187.57,,0,2.28