Hi,
Lines that need to be adapted are:
vlanirb { unit 0 { family inet { address 10.100.75.10/24; } } }
vlans { default { l3-interfacevlan.0irb.0; } }
You can also use the ELS translator here:
https://www.juniper.net/customers/support/configtools/elstranslator/index.jsp
Cheers,
Ashvin