Hi Bruce, I went back to my local Mower Shop today with more information on this Victa SPX2342 Rideon and even with the extra information they couldn't help me out. They have suggested that I email Power Lawncare Products (who now owns Victa) and provide all the details on the mower and it's deck, included pictures and ask for Belt Part Numbers and Belt Route Diagrams to suit my deck. So I have asked for an email address in a message on their Victa Facebook Page.

The Extra Information I found, along with your help is this:-

Victa Model Number:- 2691235-00 - which you provided the parts manual for, thanks again.
Serial Number:- 2016795203
DOM:- 14/05/2023

It's a Pressed Deck and not a Fabricated Deck

That Manuals Front Cover gave me 3 - 42" deck parts numbers:-

1696407
169640700
1696541-00

The deck picture in that parts manual is not the same as the deck on this mower.
My deck has 2 x spindles and 3 pulleys close together at the read of the deck. The left side pulley is the flat belt spring loaded tensioner, the right side pulley is a flat belt idler pulley and the smaller rear pulley is the v belt drive pulley. I hope that makes sense. I have a deck picture but don't have anywhere to upload it so I can post it here.

Remembering the old worn belts are 3080mm OD, that I measured.

I'm getting conflicting information again using these deck numbers as a reference:-

1758984YP = 124.4" x 1/2"
1757811YP = 94-96" x 1/2" and at another supplier = 3111.5mm

Any further help or ideas you or any members have will be greatly appreciated..

I'm doping my best to help out a neighbour with their ride on mower.

Cheers

Steve