will the resevoir off a 15* pump work on a 17* pump and do you need one with a dual setup. i ask b/c i have a chance to buy a good used 17* pump for 250 and 100 for the resevoir just wondering if i needed it

 

I'm pretty sure either one will bolt up to your res, but I do think I read some where that the face gasket is different, so you have to match up the proper gasket to the pump.
I'm sure some one who knows for sure will correct me.