what heatsink should I use

I bought an O-like heatsink to use in mi 445 build but its a very loos fit

which heat-sink would be best for the 445 diode this 405nm/445nm laser module housing w/glasses lens [OL1845-BL] - $12.99 : Welcome to O-Like.com, Your source for laser products or an aixiz module
im gunna use a fan to cool what ever I use.

Neither will be suitable on their own. You need a module, (both of the ones you mention are modules, not heatsinks), and install it in a heatsink. For 445s at any significant output they will not dissipate heat quickly enough. Even with a fan.

Look at Jayrob's kits, for handhelds, or Flaminpyro's products, (he also does labby style sinks), for easy to see examples of proper heatsinks.

M

but I thought the fins made it a heat sink