Boricua, You can get a seat cushion from Zoom cycle, they are located in San Jose, California on El Camino Real street.
I am sorry I was not clear about the handlebars. I installed Answer (thats the brand) Pro Taper handlebars. The "bend" of the bars I have is "CR high".
Because the Pro taper handlebars are larger diameter than stock, I had to use a different handlebar mount. These too are made by Answer. They do not make ones that fit the Husky, so I used ones that fit a CR250 (cannot remember the year). I did not use the universal ones they sell, as I think they are junk. I will try to get you the part name and part number.
I installed these handlebars because they are very good at damping out vibration.
I would suggest running a 32 to 1 fuel to oil ratio. I have found this produces more power. If you start fouling spark plugs, you may have to install a hotter spark plug.
The stock plug was a NGK (brand) B8EV for my bike. I now use a hotter plug, The B7EV. It helps with the plug fouling.
Note, do not install a hotter plug if you do not need it!!!!!
Chris