Sizing Images in Links Section

I’m having trouble with how large the images are that I use in my sidebar. I add the link using WordPress’s Link function, and I title it, put in the link, and enter the url to the image. I want to make the maximum size for the images 155×155. I found a way to do it for the whole sidebar, but I only want it to apply to my links section.

Any thoughts?

The site is BurningOak.com, and the purpose of this is to display a “currently listening to” area of my links with album covers. Problem is I’m hotlinking to Amazon pics since I’m part of their referral program, so I can’t control the actual file size.