1987 CRX HF question

Hi, I wanted to find out: what are the widest tires we can put on a
1987 hf (without modifying anything else!). I want to basically change
the real wheels, make them wider, and possibly the same for the front.
I also wanted to find good headlights but it is very hard to find first
gen stuff!

 

+1 should be safe...

if it has 175/70r13 then 185/60r13 should work.

 

4% speedo error. Close enough.

185/65-13 would be even better; that's only a 1.8% error. However, I seem
to have encountered problems acquiring this size for my old Mazda Rx-4, so
I had to default to 185/60-13.