ive been buying and supplying the rare spares fibreglass ones...i dont know who the original maker of these are but they are consistently fair and it isnt that hard to make them fit..
regarding the plastic ones,ive spoken to BIGCAV this arvo regarding these and he is going to look into them as again rares are not the manufacturers..
the plastic ones look good but someone has decided that they dont need the wrap around edge at the gaurd to secure them..therefore you would have to urethane them on at each end..i will take a pic and post it up..

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picture 1 and 2 is the plastic spoiler..picture 3 is the plastic and the fibreglass together..you can see the one on the van is secured at the wheel arch and the plastic one would have to be urethaned or screwed from the outside...