con rod bolts

I need new con rod bolts for this engine rebuild, but they have been discontinued (https://www.davidsilverspares.co.uk/parts/by-part-number/hpart_13213422004/). Does anyone one know of a supplier that has stock of these bolts or an alternative bolt that will fit. Thank you for your help...

Hi all, I am rebuilding a 1980 F model and everything I have read suggests replacing con Rod bolts is a must. Unfortunately they appear to be discontinued and I can't source any. The part number I have is 13204-689-004. Surely there must be a superseded part number or another one that will...