What size spark plug for a S200 toro Snowblower?

Plug is Champion RJ18Y. Gap is 0.035

This is on page 12, in maintenance section of Toro S200 Snowthrower operators manual.

Checked at local Advance Auto Parts store here in upstate NY (south of Rochester) and they cross referenced this plug and said to use Autolite # 86, Price $1.69 + tx