You can use early or late model ke20 bonnets with either guards, it doesn't matter.
The only difference is the early ke20 bonnet is straight along the front edge with a raised section of about 20cm across running through the centre.
The later ke20 bonnet has a slight v shaped edge along the front and about a 1cm across raised section that runs throught the centre.
But you would really want to use the correct bonnet for that model as as they also used different grilles between early and late models, and may look a little odd. :yes: