White Wall tires

I want to put white wall tires on my bike. It is a 1981 xs400 with mag wheels. Front wheel has J 18 x MT1.85 written on it and the rear wheel has J 16 x MT2.5 written on it. I have not been able to find any tires to fit that are white walls. Anyone know where to look? It looks like I should have a 90/90-18 on front and a 120/90-16 on the rear according to the maintenance manual.

Those tires are typically bigger body tires that run in sizes around 120 and larger, unlikely to find one as small as your front is. The tires also generally have very narrow tire tread that borders on straight lines and the front can be a handful on rain grooved pavement as a result. Lots of complaints over the front end drifting around and that being on generally heavier bikes. Making that a warning to you as well.

would the shinko 270 fit the mag wheels? saw on a facebook group with a guy running 5-16 rear and 4-18 front. i just ordered a set of whitewalls. hopefully it fits. Just not sure if he modded anything to the front or rear end

Here's another set I think looks good, if anyone can tell me what tires these are, I'd like to know