Safari gard tire carrier instructions please??

I have acquired a used safari gard tire carrier for my hard top ROW 90. Does anybody have any instructions or advice for install? I know they were mainly used on Nas soft tops but hoping to make it work. Cheers ian
 
Just hoping to see if anyone has anything or pictures close up if one installed. Many pics in internet but not much close up
 
I got it second hand, must be dumb because it doesn’t look self explanatory, much different than Mantec I have put on before
 
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