2 cylinder BX1500, hot to tap in for cab heat

[reamer]

2 cylinder BX1500, where to tap in for cab heat

I've been watching Ping's home made cab for his BX, Gonna start one for my BX1500, being smaller and a 2-cylinder instead of the common 3 cyl, where can I tap in for:

(A)Flow to the heater, and then, (B) return from heater to the tractor.
Thank you in advance.
(I like the idea of the Prius 12v water pump for the cab heater)

 

[Ping]

Reamer,
I'm utilizing the thermostat bypass ports on my BX2370. Let me guess and your BX1500 is the thermosiphon variety?
I'm not familiar with that setup, but would venture a guess, you'll have to tap into the rad hoses and utilize the 12V pump you mentioned.
For those who know what they're talking about, if I got this wrong, slap me upside the head!