I assume ET48 pretty much same as EB48 for ESC area.

I had a HW150 in the EB48, but it was very tight. As in so tight that the sensor wire was basically sandwiched by the body/side guard, and on the other side the front center drive shaft is mm's from the ESC. That was the only config that would even fit with motor.

I put a HW SCT Pro in there because I was afraid something would get damaged or shorted.

I would go with a different ESC if I was you. Just not enough room for HW150.

Too bad becasue I like the 150 also, great ESC. Works really well with Tekin motor!