I have 2 sets of steel over the tire tracks for my 453(same wheelbase as the 443). A set of Loegering's for the 23 x 8.50 - 12 tires and a set of Grouser's for the 5.70 - 12. The Loegering's don't require spacers, the Grouser's should have spacers but I just flip the wheels around to get enough room. Here's a picture of the Grouser's. I'll have to do a little searching to see if I have a picture of the Loegering's mounted.If you go to any of the track manufacturers sites they will have a chart showing applications and whether or not you will need wheel spacers.
If you do, all the spacers I found were made in china and the best deal was on e-bay. Also if you buy used tracks most manufacturers sites have instructions on how to mount them. If you do it right it is just a one man job and doesn't take too long.
Yes, the Grouser tracks will rattle your teeth on hard surfaces. I use them when the ground is very soft from late fall thru the spring. They do make ruts and tear up the ground when turning.I have found that on hard gravel the grouser tracks I have will jiggle your teeth out but they are great for traction in the muck. If doing it again I think I'd get either tracks plus or loegering with more of a flat pad for smoother ride and less damage to the grassy areas. The bobcat dealer here carries the parts for the grousers which is handy.