Will the square tank replace your current tank? When I did my rad replacement last year, an OEM square tank with float was only about $25 from an auto parts store in the Bronx ($35 from newandusedvolvoparts.com). Threw in the "level guard" sensor for $20 at Borton, and I was good to go. Just clips in. No drilling, no mess. The only question would be if the pressure requirements are the same between the round tank and the square one. Since my original was square, I wouldn't know. But that info is probably readily available.