i've used mustangs unlimited for many years and really like the service they provide and they almost always stock the parts i need. i have had some items backordered that were not really crucial parts though, but that is going to happen with a lot of the suppliers. really the only parts i have had backordered from them were my 69 shelby walnut automatic shift handle, a front license bracket and a wiring loom retainer kit, all parts were deliverd in a reasonable amount of time within a month or so. another thing to consider when deciding what years to look at is that the later the car gets the harder it will be to get parts. for instance there is very little that you can't get for a 65-66, 67-68 there are a few parts that aren't available, but not many. 69-70 quite a few parts that aren't reproduced and many parts are pretty expensive, 71-73 a lot of parts that aren't reproduced and many parts that are very expensive. get the best and most complete car you can afford even if the initial investment is somewhat more than a similar car that is not in as good of shape.