1967 heat box question

[67dodgechargerjeff]

im in need of a working heater box for my 67 charger...just not sure what number box will work...my car is non a/c...is it the 717 box or the 747 or 724 box   any help is greatly appreciated....sooo many boxes look almost identicle.

[VegasCharger]

Welcome aboard to the great community!!!

I'm sure some members will weigh in for your question as there's a lot of helpful peeps in here.