My lord how hard headed are you? Looks like I wasted my time posting what the PN and size are.
First that red thingy [circled] is call a shroud. The other red thingy is a nearly worthless fuel filter.
The damn o-ring is PN 697123.
As for the idle mixture screw [arrow pointing to it] on that Nikki carburetor it is there just for looks at times as they put in a restricter jet that prevents most from going too rich. Although at times you need to go slightly richer to stop lean burn surging. Just got to know where it is and how much to resize it to. You can easily enlarge too much.
Here is an example the retail prices depending your source for the same exact o-ring.
View attachment 73680
If I was greedy I buy at the lowest price and sell at Briggs price.