OR - thermo fan off a kawazaki ninja ..
both are similar sizes ..
Note though this fan only helps cure heatsoak when stationary or moving at low low speeds - When moving at speed the top mount for its size is very efficient ..
Its a stopgap measure - not a cure ..
If you want a better cure - try frontmounting the same cooler - or start saving for a frontmount setup the likes of a JZA70 core or larger..
I notice the car in the pic is a st162 (?)
if so you could try and source the water to air unit 0ff a 165 Gt4 as it should in theory - bolt in
*edited for clarification *