Hey pan, I figured out why things just don't seem like they are quite right. To start I had not mentioned that I actually used the bottom of my drum for the top. This is where the difference is as far as the drums I have. The top outside edge of my next drum is 23 1/2". Way to big for the biglots grill. I didnt actually measure the bottom but heres a couple pics of the top and bottom with lid nearby and also one that maybe shows the lip I flattened and reformed for mine.
This is trying to set the dome lid on the top of the drum after taking the open top lid off. Sorry to anyone I may have mislead here, I forgot that there was that much difference.
Here is the lid set on the bottom of the drum.
And here is a close up of the lip on the lid that I use on my current drum.