Having just done an AAZ transplant, here's my low tech solution: Once the
AAZ was in I stuck a piece of stiff wire (welding rod) down the engine's
dipstick hole till it hit bottom. Marked the rod at the top of the dipstick
receptacle, measured length (?17") and width of receptacle (?5/8") Thus
armed I went to our local wreckers & wandered amongst the Japanese wrecks
till I found a stick that matched. With the enigne filled and run to fill
the oil filter I punched the new dipstick to give me an  index mark. I used
 the AAZ dispstick in the rear filler; the cap needs to be drilled out to
accept it. Hope this helps, David