Hello i am trying to get the correct advise on how to know for sure what the correct date coded spark plug wires would be for my car i have looked at several places and one tells me that if the car was built in the first quarter of the year ( September of the previous year to March 1st of the following year) i need 3Q of previous year and ( March to September of the current year i need 1Q of that year) Any guidance would be grateful as i don't want to buy them twice. Classic industries states if my car was built in the 1Q i need wires from 1Q everybody else is saying if it is built in the 1Q then i need 3Q from previous year. My car is a 1969 GTX 440 HP with a build date of 2nd week of February 1969 also are the reproduction date coded wires upgraded as far as the core and the materials that the boots are made of. The reason i ask is i don"t want radio noise and i do not have the heat shields for the #6 #8 and #7 plugs i was told the new wires are original in appearance but have been made to today quality standards thanks for your help.