Subject: another floorboard question

I saw an auction on ebay (i think) for a complete set of floorboards for
the loops. It stated it included a set of longer motor mount bolts. I
matched my floorboard rails to the frame yesterday and it appears the
stock mount bolts will work, close but do-able. Any words of advice or
caution for me from the previously initiated? Do I need to search for
longer bolts?
Thanks
Ray