10 bolt/ 12 bolt backing plates

I currently have a 1970 Buick 10 bolt in my skylark. Im doing a rebuild on a 12 bolt from a 69 oldsmobile. Im not sure if my old backing plates will fit switch over to the new 12 bolt from the 10? any help?? rebuild is scheduled to start by next week.

 

They're the same part so you won't have any issues switching them.

 

Okay great. Thanks for the help much appreciated!