Of the two, the OSC-188 is what you want. Be sure it's all aluminum. Some sites list plastic tanks or don't specify. So give them a call if not clearly stated. Also, look at aluminum radiators for the Starion. Hose, core and overall sizes are the same. The mounting brackets are short so a little fabrication may be needed. Here's an example:

https://www.b1speed.com/1161_Radiato...SABEgKa1_D_BwE