Unfortunately the 400 series is just about the only car that they won't fit. unless some other manufacturer makes them for these cars. To remove yours for cleaning a pair of long nose pliers is the easiest tool to use. the jet is held in by two sping out lugs on it's underside. they can be a little tricky to get to but persevere! once you have released the jet detach the pipe from it and blow an airline through the jet if possible. try not to let the pipe slip back through the hole too much. if you lose it they can be a sod to thread back through. best way is to grip it with a pair of self locking pliers if you have them.
hope this helps
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