bro,
in fact 15" x 6.5jj can be used. But it will be a lil inconvenient because u will have to depend on the rim's offset too. Usually the best case scenario is when u can get a 15"x5.5jj or even 15"x5jj rims..i know for taiwanese and local rim is a lil rare on this size, but i remember there are several model. thats y i chose jap rims wit 5.5jj..hassle free.
for the tyre size..u wouldn't get much choices in m'sia
the selections are like :
165/50/15 (falken Azenis)
165/50/15 (toyo trampio/mp sport) - one of the good ones..i like this the most
165/50/15 (nan kang)
165/50/15 (kumho)
165/50/15 (silverstone ftz -if i have not mistaken)
165/50/15 (dunlop)
175/50/15 (goodyear NCT5 - savvy's size)