Holes don't line up

[steplift20]

I bought round rail bases to replace the broken ones And of course the holes didn't line up , so I kept the old ones in when and if I do replace them I have to drill two new holes, what should I use to fill the holes that are there and when I redrill them there going to be very close to the ones that are there now, Thanks If and when I do it I will do it in the fall Or next spring