I was correct, see rule 4.2:
Windshields and wipers. (Stock windshields, true Lexan, or circle-track mesh are acceptable; non-Lexan plastic is not acceptable.)
Full rule:
4.2: Safety Equipment DOES NOT Count Toward $500 Total: Safety equipment described in Section 3 DOES NOT count toward the $500 total. "Safety" refers to things that can save the driver--not things that can save the car.
4.2.1: Beside the items and processes listed in Section 3, the following are considered safety-related and therefore exempt:
Wheels, tires, wheel bearings, balljoints, and brake components
Exhaust systems downstream of the header/exhaust manifold (NOTE: Turbos and related components are NOT exempt from the $500 limit. Nice try.)
Windshields and wipers. (Stock windshields, true Lexan, or circle-track mesh are acceptable; non-Lexan plastic is not acceptable.)
Driver comfort & information (steering wheel, shifter, gauges, pedals, cool suits, vents, heaters, radio)
All fuel hoses, fuel fittings, fuel filters, and related mounts
All fuel-system components upstream of the fuel pump, including tanks/cells, mounts, fillers, vents, etc. (NOTE: Fuel pumps, carburetors, injection pumps, computers, and individual injectors are NOT exempt from the $500 limit.)
Link to rules so, you know, you can read/search 'em:
http://www.24hoursoflemons.com/pricesandrules.aspx
NSF Racing // Speedycop Gang
Summit '10, CMP #3 '10, Autobahn '10, CMP #1 '11, NJMP '11, CMP #2 '11, Summit '11, Gingerman #2 '11, Stafford '11, Charlotte '11, Autobahn '11, ECR '11, CMP #1 '12, NJMP '12, Gingerman '12, NHMS #1 '12, Summit '12, CMP #2 '12, NHMS #2 '12, ECR '12, CMP #1 '13, Infamous Rulebreaker: Chihuahua Express '13, ECR '13, Summit '13
Class C winnah! (x2)