Zakly what I was asking. Thanks.

'Cept ... 14 & 12mm sound like the wrench size, not the bolt size.

The main reason I asked rather than just buying an assortment was that when I installed the seat extender, I stripped one of the bolts holding the seat down. I had a hard time finding a tap & replacement bolt because it was an odd size & thread pitch. Sooooooo - if these are odd too, they may not come in a standard assortment.

Question ETL - how come anytime someone asks a technical question, you come back moments later with pix & everything all prepared. Are you psychic? LOL