The guards simply have a cut-out for running boards - there is no additional piece. You either use the full mudguard, or the corner trim piece. That said, using mudguards when you also have running boards kinda makes them a moot point.
I didn't look into availability, but these are the OEM part numbers for the ones to use
with running boards (as noted in post #2).
76603-60011
76604-60011
As you see in the thread below, he was in the opposite situation to you, and mistakenly received the guards that you are looking for.
I removed the running boards from my 94 FJZ80 and attempted to add front mudflaps in their place but received the wrong parts. The mudflaps received have cutouts for the running boards. Ack! Can you help? This is what I ordered, where did I go wrong? 76603-60011 Mud Guard 90159-60416 Screw W...
forum.ih8mud.com
View attachment 3758907
I have the type he was looking for (
without running boards). It appears the guards with a cut-out end in 11, while the others (like I have) end in 21. Both are printed on mine, with the 11s including a note in Japanese. Not sure why that is.. maybe it was only a JDM option... but anyway
View attachment 3758920
My truck was totaled, and I never removed the boards, so it still has the trim pieces. It's also a 97. They may have the part number printed on them, and I could check sometime in the next day or two. Doesn't guarantee availability, although I could probably sell you mine. I'll get back to you.
Ps - if anyone wants my non-runningboard mud guards, they're for sale