Looks like most all parts are avail. Should be able to get em from an online vendor if ya cant order/ get them locally.
Your gonna need the model no. FC420V-S?? . Should be an S01 to an S28 or so. Should be on a sticker but probably is long gone. You might can look up the number at Exmark.
It ain't rocket science!
'Course if yer house has more wheels than yer truck...
" Old age ain't for sissies "