Just replaced mine
My hoses had cracks similar to yours and I had fuel stains up by the flange, indicating the gaskets were leaking. The A&P I use for advice and condition inspections told me to replace the gaskets and hoses. I thought about buying the SDS kit - it looks like a really nice product and has great reviews, but I didn't (frugal side of me won).
My experience: The back bolt/screw for the flange on cylinders #1 and #3 (right side) are hard to get to (probably why some have replaced with allen head cap screws). A universal joint socket worked well for me. My hoses and flange gaskets came off easily. There was a lot of "gunk" inside my tubes. I'm guessing it was old fuel, oil, carbon residue. I cleaned the tubes in a parts washer. The flanges also went in the parts washer.
While you have the tube assembly removed - take the opportunity to give that area a "good look" for any other issues.
During installation, ensure that the flange end of the intake tube elbow fits completely in the recess of the flange - it must lay flat against the cylinder.
As others have noted, use new lock washers. Note that there are torque settings for both the bolts and the clamps on the hose coupler.
Use torque seal on the bolts and check them after flying a few hours and then periodically to be sure they are not backing off. (you can also watch your EGTs for an indication of a leak)
Download an overhaul manual. (I used XP360_OverhaulManual) It has exploded views, torque settings, and installation instructions.
Hope you find this helpful -