Tube and fin is less efficient than fin and plate, the cost savings to efficiency isn’t really worth it. Spend the extra money IMO

I have ran these with good results in a couple XJs:

Hayden Automotive 677 Rapid-Cool Plate and Fin Transmission Cooler https://www.amazon.com/dp/B000C3F3SO/ref=cm_sw_r_cp_api_i_YY9GZK2MX4V337BGCX89?_encoding=UTF8&psc=1