YZ400D Skid plate?

[Beast Mode YZ400]

Hello,  Does anyone know if they mad an oem or aftermarket skid plate for the YZ400D?  I understand that it was not originally equipped with one,  I am wanted to ride up the hills and want to protect my engine etc from rocks and logs. My bike is a 1977 YZ400D 2 stroke, thought maybe could use the IT400 77 or 78 skid plate?  However not sure if it would bolt up the same etc.  Please advise.  Thank you

[S.O.A.N.Z]

One of these may work

https://www.ebay.com/p/Skid-Plate-1978-Yamaha-Yz400-YZ-400-Case-Protector-Guard-Metal-Engine/6007642602?_trksid=p2047675.l2644

https://www.ebay.com/itm/Yamaha-Skid-plate-DT-250-DT-400-MX-250-MX-400-YZ-400-1975-79/263711375391?epid=1325150467&hash=item3d666c401f:g:xpgAAOSwbbdbBvbu

https://www.ebay.com/itm/1978-Yamaha-DT250-LOWER-BOTTOM-SKID-PLATE-GUARD-SHIELD-1M1-21471-00-90-MX-YZ-400/142803997791?fits=Make%3AYamaha|Model%3AYZ400&hash=item213fc8145f:g:X8sAAOSw0O9bA2Ng

https://www.ebay.com/itm/1975-1979-YAMAHA-YZ400-MX250-MX400-DT250-DT400-BASH-PLATE-SKID-TWINHSOCK-EVO/222695084021?hash=item33d9a94ff5:g:zWcAAOSwTEJZ8w5n