Switch to rats? Size comparisons plz

[sassamagoo]

I have currently been feeding my baby boa medium size mice (f/t). They seem to be about the perfect size for him at this time.

My issue is I have read on some other threads the recommendation to switch to rats as soon as you can as some snakes can get "addicted" to mice. My problem is my 2 local pet shops don't offer rats in the small sizes. They go straight from mice to adult rats (small/med/large). I know there are some sites I can order f/t rats from but I don't know what is a good comparable size to what I'm feeding my boa now.

So the gist is: What size rat is equal to a medium mouse? Fuzzies? Weanlings?

I don't want to order 50 rat fuzzies just to find they are too big or too small. I'm sure I would be able to use them eventually, even if too big, but I don't have a ton of freezer space to waste, lol.

Thanks again in advance, everyone here is such a great help!

Sass