Just to help things along:
The Lesabre is a b-body.
The body style you have was used from 1977-1979 even though the turbo coupe didn't come into play until '78. Many body parts will interchange with the Olds Delta 88 coupe from that same time span.
The same basic chassis was used on all b-bodies all the way through until the end of production in 1996. The RWD Lesabre, Delta 88, Custom Cruiser, Roadmaster, Caprice, Impala, and Fleetwood all share many common chassis parts. The exceptions are that the Cadillac Fleetwood/Brougham had the frame stretched 6 inches to provide more rear legroom, and the wagons have a slightly revised rear frame section. The '80's Caprice police package (9c1) as well as all b-bodies produced from 1991 to 1996 have a 5x5 bolt pattern as opposed to the old standard of 5x4-3/4
For anyone interested in restoring this car who aren't concerned with concourse quality period correctness, you're able to do cheap upgrades using parts from the mid '90's Caprice/Impala SS such as lowering shocks/springs, 12" disc brakes, rear disc brakes, control arms, and so on.
If I had the space and money I'd be all over this, even though I prefer the revised styling from '80 onward