Have you got ABS on yours? If so, those are the wrong ones.
https://www.ebay.co.uk/itm/Volvo-740...t/293190048616
https://www.ebay.co.uk/itm/Volvo-700...y/362709735797
First link is to the ones you've bought, second is for the ABS version. In fairness i can't see any evidence of an ABS sensor in your pics other than the hole in the backplate for it.
Must admit, that's a good price for them, when i needed some, there were virtually none available except for about £125 each, spotted a pair newly listed on fleabay (NOS) at £2.99 each + £10 P&P each so snapped them up then and there.