Can someone please tell me what size of screws do You have to use, to tighten every plastic and every piece of interior stuff?

I have fully removed interior from this DSM, that I am working on. And, as beeing totally new to interior installing game I don't know what kind of screws I need and I have no reference as well, because there is none of them left. I am talking about dash also.

What kind of size are they?

Just a trial and fit will work I'll send you some.

Mostly wood type screws with large phillps pan heads on them.

There are several different types of Phillips head screws that hold the interior pieces together. Most of them are just aesthetically different. Please do not use wood screws to put your car together. The cheapest way that most people get all the screws they need is to go to a you-pull-it junk yard and take everything you need from a donor car there .

What Iheartmyhonda said. If your lucky at a yard half of them will out already and just laying on the car and you can pick them up and move on your way. Almost all Mitsu's share the same interior hardware so just find a Mitsu and start removing.

Also, there are sme machine screws for vaious things. Most if them are 10s and 12s with the exception being the seat belt and seat mounts.

If you have a Chiltons Manual it should have a page listing all interior screws. I believe mine was on 10-22 for 1g cars. Basically most of them are self tapping and 6mm diameter, many different lengths / head styles.