Dried fruit is not really a 'natural' part of a Rabbit's diet. It contains alot of sugars which can cause significant gut problems. Personally I never feed any dried fruit to my Rabbits.
Again, Porridge Oats are not really good to feed unless your Rabbit is very underweight. It is high in carbohydrates which can easily cause yet more gut problems.
For treats its far better to opt for natural things such as Fresh Herbs, Dandelion Leaves, Bramble Leaves, Apple Tree Twigs etc etc
For Rabbits sugars and carbohydrates, whilst often popular, are also often the cause of digestive problems and in the longterm they dont do the Bun any favours.
If you do want to feed a 'sweet treat' a small piece of Fresh Fruit (Apple, Pear, Banana ) once a week would be OK