Deckorators72213 Newport Classic Treated Post Cap 4x4

Is this post cap available in 5 x 5 also (4.5 x 4.5)?

What is real size? above its 6.3x6.3x3.8. below from mfg. says inside 3 5/8" for posts 3 1/2x 3 1/2...so which is it.?

Do you have 24 of these please?

The title of this product says it’s a 4 x 4 cap, but what I gather from the description, the cap is 4 x 4 but doesn’t fit a 4 x 4 post? Is that right?