What's the power supply for? I'll assume it's for an AM rig in commenting.
I'd look for something else. reasons:
1. Those look like energy discharge caps to me. Maybe they are designed for filter duty but I've never seen anything like that for 2 KV filtering.
2. for 2 KV you'll have to series a pair. 2.1 KV rating isn't enough and even if it were, you'd have 200 uF
3. Even with two, you'll have 100 uF. That's way way too much with a filter choke and it is too much for a cap input filter and no choke. The reasons are that the stored energy is too much. If the cap suddenly did a fill discharge for some reason, it might do some expensive damage. More important, assuming you key the rig by switching the AC service to the h.v. supply primary, the cap charges every time you key into transmit. A soft start with a time delay relay is okay for a leenyar where the B+ stays on, but speaking for myself, I wouldn't want to recharge that much capacitance on every single transmission, even with a high resistance bleeder.