You need to configure destination IP with these ports. You need to configure destination pools, for example:
set secutiy nat destination pool pool_51413 address 192.168.5.160 port 51413
then configure destination rule:
set security nat destination rule-set Nat-Inside from zone untrust
set security nat destination rule-set Nat-Inside rule rule_51413 match source-address 0.0.0.0/0
set security nat destination rule-set Nat-Inside rule rule_51413 match destination-address [your external IP]
set security nat destination rule-set Nat-Inside rule rule_51413 match destination-port 51413
set security nat destination rule-set Nat-Inside rule rule_51413 then destination-nat pool pool_51413
finally you need to configure security policies:
set security policies from zone untrust to zone trust policy pol_51413 match source-address any
set security policies from zone untrust to zone trust policy pol_51413 match destination-address 192.168.5.160
set security policies from zone untrust to zone trust policy pol_51413 match application 51413
set security policies from zone untrust to zone trust policy pol_51413 then permit
Try it, I hope this works.