Tim, you need to find the fattest you can and then get the screws one size thinner and also get a few of the fattest ones. You need to drill the correct sized pilot hole too. I know that sounds odd but if/when you strip a thread you've still got the fatter screw to save the day.
Unfortunately, I don't agree with stevetheboat on the length of the screws. By the time the screw has passed through the washer and the consol, at ¾" (19mm) you'll only have a few millimetres of screw doing the holding.
Although it pierces the deck, I'd go straight through. (Anything under the deck?) The length needs to be; washer, flange, deck and a bit to spare cos the tapered end of the screw does nuffin.
I do agree with the other folk that it's essential to use a sealer around the flange and skooshed down each screw hole. I've found good silicon sealer is more that adequate. However, a wee warning if you choose to use it; it is very slippery and will seriously lubricate the pilot hole and it is then VERY easy to overtighten the screws and strip the thread.
All from experience. I didn't google a thing.