Traditional suppliers do not have them anymore: 500V P channel mosfets in TO220F (full package).
Some possible candidates.
FQPF1P50
https://www.mouser.com/datasheet/2/149/FQPF1P50-189292.pdf
FQPF3P50
Who has some NOS lying around?
Some possible candidates.
FQPF1P50
https://www.mouser.com/datasheet/2/149/FQPF1P50-189292.pdf
FQPF3P50
Who has some NOS lying around?