bought this before i started playing with methanol. it is larger than a 12 rad, and has more cooling passages. my intent was to put it on my turbo bike as an upgraded cooling system with dual fans etc. it was a tight fit and the bottom has been clearanced/slightly bent to fit the turbo. it is functionally 99%. bolt it up to a 14 with no issues. with some customization it can be made to a fit a 12 but most users will not need this. easier to fit this to a gen 2 12 with the later style motor mount. im selling it as i didnt even need the full cooling capacity of a 12 rad on a mix of methanol and gas this summer (2/3 of a stock 12 rad with no heat issues on the turbo 00). so its rather pointless to increase cooling capacity when i plan on running meth on both bikes.