Heater core bypass ?

I've got a 89 gt and the heater core took a dump yesterday.
I'm planing on replaceing it....but don't have the time right now.

I did a search and found different threads on the subject and also different size reducers to use. Can anyone tell me what size reducer I would need ?


Thanks
 
you dont need a reducer, just get the bigger sized hose of the two, and run it in a U shape, the hose clamp will take up the difference in size.

Ive been running this way for years, not a single leak