Why do you want to replace the capacitor?
It looks fine.
A friend of mine also has one of these actuators and his board got eaten away, more than mine, with saltwater dripping on it. I made a replacement board, but need the cap!
If you're making your own board, then presumably you can change the footprint, so long as it's not too big for the case.
Have you measured the voltage across the capacitor? Does it actually get anywhere near 106V, the RMS voltage with a peak of 150V? As mentioned above, the voltage rating is probably selected for the size.
I would use two 68µF low ESR capacitors connected back-to-back, to form a 34µF non-polarised capacitor. Choose as larger case size as you possibly can, given the space constraints and voltage rating, which presumably doesn't need to be above 50V, although check first to be sure.