Sliding glass door wheel

Hello,

I am attaching pictures of our tandem rollers. The one that I found o. Your website tha most closely matches them on your site is part 81-187. However, our has a little metal piece that stick out on both sides that fits into the sliding glass door which prevents it from moving. I see that yours does as well. I don't see how many inches that metal piece is from top of the wheel frame to the top of the metal piece. Based on the pictures I provided would this be an identical part? Or is there a different tandem roller you'd recommend.