Hello masjo19,
Welcome to the DigiKey TechForum community.
These look to be axial throguh hole film capacitors from MKP series.
For the first one that is marked MKP 3uf 5% 450VDC, I found a close in stock similar in part 399-C4GAHUC4300AA1J-ND it just has a higher maximum voltage at 600VDC instead of 450VDC.
For the second one that is marked MKPH 0.68uf 5% 850VDC, I found a close in stock substitute in part 2870-MKP1839468084HQ-ND. This one has the same rating as the one in your photo, 0.68UF 5% 850VDC.
Hope that helps.