For this Laptop all you need is a Slimline drive which you can buy at NewEgg or any other place that sells the things.
The next hurdle is finding out the master/slave encoding of the existing drive. Slimline drives DON'T HAVE MASTER / SLAVE / CS jumpers! This stuff is done in the drives firmware, for which the manufacturers usually have different versions downloadable. Another problem: due to space constraints some Laptops use reverse Cable Select. The Laptop in effect tells the drive to be Master but the drive interprets this as Slave - which is the way it is supposed to be, weird as it is.
So, a quick check via google reveals that the Solo1200 uses regular Slimline drives which have to be encoded as Master. All Panasonic / Matshita drives fall into this category.