I'm not sure i don't have exact dimensions if i get bored this weekend i'll measure them up for you, i first joined this forum and saw one of the bikes in the gone but not forgotten section and in his mod list it said he makes air scoops well he hasn't been on in like a year so i just fooled around with cardboard til i found something that looked reasonable then cut and bent the steel to match the cardboard template. If you want i used the pics of Yamahaquad350 in the gone but not forgotten section and from his pics i just did trial and error with cardboard.