Loud tapping noise and belt squeel came from my serpentine belt slipping due to broken belt tensioner bolt.

Had several problems with my belt tensioner shock absorber bracket breaking in half. Right in the weak spot at the bolt nearest to the shock absorber.
Welded the bracket two times and it broke again.
Last time I welded an ekstra flat iron on top, and re-drilled the two holes.

Now the belt tensioner bolt broke instead. (I only moved the problem as it seems).
Seems like my serpentine belt is to short! Can that be the problem?

Parts on my van: 1994 E-350, 7.3 Diesel, Engine vin: M
Serpentine belt, F4TZ-8620-T (JK6-1118) lenght 111.4"
Belt tensioner, F4TA-6B209-EA

Old belt in the trunk: lenght 111.0"
The belt and tensioner was changed 6 months ago for previous owner by Ford dealership.

Do I have the right tensioner and the right lenght belt for this engine?????
If not please give me the right part numbers.