Need help with roof rack clamps to fit the roof gutter/rail

So I've been trying for a while to get a roof rack for my mk1 golf but no one was willing to dismantle one and post it. I finally found a guy on ebay who dismantled and sent me one only to find out It had no clamps to attach it to the roof, ive been searching about and struggling to find a set of clamps so I can fit this. Could someone send me in the right direction for these please, has anyone got a pair for sale? or is this something I cant find and will need to have ones made or something, just want to get my roof rack on the car ye know. Its a desmo roof rack btw, thanks in advance guys

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