You are correct that the SportRack # SR1098 does not fit on vehicles with naked roofs, like your 1991 Volvo 740 Wagon. For that reason you'll need to use something like the Inno Roof Rack that uses parts # INB127 and # INSD. This Inno rack gives you a great quality rack at a value price and will attach via the rain gutters on your Volvo.
I've attached a review video of this rack for you to have a look at, as well. view full answer...
Yes, I checked with Thule and the Thule Passage Trunk Mount 2 Bike Carrier, item # TH910XT, will work on your 1987 Volvo 740 Sedan.
I was also informed that the TH911XT three bike rack will also fit your vehicle. view full answer...