Front exhaust section

[D n D & K]

hello all we have got one of these (see pic) lovley things in our exhaust system

my question is we have to replace the front section as its cracked right at the front ( not suprising as it rigid up til half way ) cannot afford to do whole sytem at mo . So is the front section always the same length on all bongos . anyone know what size bolts n nuts they are the rusty ones lol as im guessing mr angry ( the angle grinder ) will have to come out and play .

Thanks in advance