Hi Bart,
Old style wing struts were limited to VNE 153 mph CAS somewhere in some 1977 AD. These were round-ended where they attach to the wing.
New-style wing struts, sold by ACA, and by Wag-Aero, and maybe more PMA's, are square-ended on the strut-to-wing fitting and allow the plane VNE to go back to its initial 162 mph CAS.
Main differences were the strut thickness, and some internal corrosion-proof finish.
My struts, for example are the original 1969 ones, so I'm limited to 153 mph VNE. Sometimes I thing the other 9 mph would help me on low-level airshow displays, but the next second I drop that idea, as diving for some extra 9mph costs me 50ft more !!!
As Bob Hoover wisdomly said, it's not how far to the ground that counts, its how precisely you can fly your airplane. 153 are enough !!!
Make some boroscope through the attachment fittings to see the inside, dome Dye Checks on the struts/fuselage attach points to check for hidden cracks, and as long as the struts are OK, never bended, and non-rusted stick with yours.
Your main strut seems to be the new-style one. The rear strut is still rounded, I'm not sure if the new-style rear struts are square too.
Fly safe, keep us posted on your Citabria updates. Put the bird flying soon !!!