Anyone use Raybestos 2932R drums?

Hi folks, hope you can help. Was planning on replacing the rear 10" drums on my 69 Barracuda. The local parts shop is suggesting Raybestos 2932R. I checked online with Rock Auto and there seams to be listings for both 2932 and 2932R. Is the "R" just a designation for rear? Are they the same thing? They look a bit different, wider than my stock units.

Thanks for the help.

Patrick