Im way too cheap to buy the thunder 51010 stock cover kit so I'm wanting to make it instead. The question I have is what are the dimensions of the air filter. I'm hoping it's either a standard harley part or a 6-3/8" automotive size. Also, I've heard of complaints with metal backing plates on big air kits due to heat soaking of the temp sensor so I'm going to try some 1/4" lexan instead. Thanks for any input guys.