ok. then your car is an st204(not 202)
no 5sfe alt brackets don't work.
for the dip stick you need to remove the brass sleeve in the block that the dipstick tube goes into, then fit the dipstick tube from the 5sfe (they have the same sump as gen2 3sgte so oil level reading will be fine)
you can use the crank pulley from the 5sfe.
you should be able to sourec the ALT brackets. i'll check what i have at home. can't recall if gen2/3 are different for the top ALT bracket.
have you joined OZcelica?