Plastic trim strip for window case mod? Where to source it.

Hi Guys,

I wanted to create a narrow window on my Cooler Master Elite 130, however I wanted to do a nice job (I tried in the past on my Elite 120 it came out not that professional) and I have found out about the above trim, gasket, no idea how you want to call them which seems to be the best option to have a window and cover the edges cut.

However I cannot find it anywhere I have also tried some Chinese website such as Mod DIY but nothing...

Any suggestion?

What if you try searching for rubber u-channel?

Im sure the bay will have it.