The PartsShop should have the wrenches as well as IMPCO stated by WmHarlow above. The dealer too can order the wrenches for you. The set consists of two 14 mm open end wrenches and one big retainer wrench which is the topic of this discussion. You can buy the wrenches separately.
Reading Larry's posts, I now realize that I could save 5 to 10 minutes by using the big wrench only when it is needed. I was going by the book using the big wrench on each valve.
Thank you, Larry.