Getting gauge to knit the Wonderful Wallaby sweater

Hello!! The Wonderful Wallaby sweater calls for a size 8 needle for the main body and a size 6 for ribbing. I did a gauge swatch and I get gauge on size 7 for the body. Now, do I have to go down to size 5 needle for the ribbing? Or do I stay with the size 6? If you’re familiar with this pattern you’ll see the ribbing is used for the bottom of sweater as well as the cuff on the sleeves. Thank you for any help. I’m so excited to start but it seems like it’s taking so much time just to move forward!!

Does it say what gauge they want for the ribbing? Patterns usually have gauge info