Ya know sometimes there is so much false information on these threads it boggles the mind.
I have an 08 and in the middle of the seat is the oil fill stick, ya do not even have to take the seat off to change the oil. :joke:
The Level one 08 does not have heated seat or grips.
A heated seat even in the south is a good thing, hey even in South Carolina is can get down to the teens in the winter.
A heated seat that works correctly you can feel through ATGATT. Problem is the dealers simply are clueless about how to work on the heated seat and it is problematic at times.
However heated grips and a heated seat can quite easily be added to any GL1800. It is not a big deal.
Any of the heated grips aftermarket or your choice do well.
For the seat, you simply buy a factory heated seat used, that someone has taken off for whatever reason. Put that on the bike and use standard heat controllers from heated gear clothing to power and control it.
There is an ornery speed demon on here, his name is ROCKY, I do not know if he invented that but his method is the best. And he will help anyone , so he would be happy to email instructions to anyone how to do that. It is quite simple actually. And economical. Does not cost a whole lot.