Commando valve guides???

Hi!

Im into changing my valve guides in my Mopar Commando heads!
Im using the P5249186 (2.08, 3/8 stem ) intake valve and the P5249188 (1.65, 3/8 stem ) exhaust valve. Both are 3/8 stem, the problem is i dont know what lenght to go with on the guide? I dont have the heads at home so i cant meassure them! Anyone have commandos at home that they can meassure on!?

Please help!