V belt placement and how many belts

My records only go back to 86, Take a look at this and see if it helps.

https://www.2carpros.com/diagrams/buick/lesabre/1986

I LOOKED EVERYWHERE

FINALLY LOOKED UP THE BELTS FOR YOUR RIG AT "ADVANCE AUTO PARTS"

I "ASSUMED" YOU HAD "A/C" (BELTS ARE DIFFERENT W/O A/C)

I ADDED 4 DIFFERENT BELTS FROM THE SAME MFGer TO "MY SHOPPING CART" THEN TOOK A "SCREENSHOT"--CROPPED THAT PUPPY AND IT IS THE DIAGRAM BELOW!

LOOKS LIKE SOME OF THOSE BELTS SHARE SOME OF THE SAME PULLEYS (MULTIPLE GROOVES) BUT RUN DIFFERENT ACCESSORIES

GO TO THE ADVANCE SITE AND ENTER YOUR CAR INFO, SEARCH "BELTS". FIND THE ONES I HAVE LISTED AND IN THE DESCRIPTION, IT WILL TELL WHAT PULLEYS EACH RUN ON (MAKE BELIEVE EXAMPLE: FAN/ ALTERNATOR/ A/C)

AS FAR AS TENSIONING, THIS IS "OLD SCHOOL", NO SPRINGY TENSIONERS! SOME OF THE ACCESSORIES HAVE "HALF MOON" AND OTHER TYPE SLOTS , THAT YOU LOOSEN THE BOLTS AND ACTUALLY PULL/ PUSH THE ACCESSORY TO MEET UP WITH THE BELT LENGTH, THEN THE BOLTS ARE RE-TIGHTENED (SOMETIMES A BAR/ TOOL/ ETC IS NEEDED TO GET THE BELT TIGHT ENOUGH (A BUDDY W/ SOME EXPERIENCE WOULD BE A PLUS)

2ND PIC) MY JEEP CJ-5s ALTERNATOR "HALF MOON" SLOT (IN THE BRACKET) AT 2 O'CLOCK. THE ALTERNATOR PIVOTS ON A BOLT AT 6 O'CLOCK. THE WHOLE ALTERNATOR PIVOTS TO THE LEFT TO TENSION THE BELT. I'M LUCKY! BOTH OF MY JEEPS HAVE ONLY ONE BELT (AND A SPARE ON BOARD TOO!)

THIS HELP ANY?

THE MEDIC