Hi Chris,
I called at the cemetery office for detailed section plans first, and although there were no headstones marked on them for your Hollands. went to have a look anyway as not all are yet marked on the plans.
Unfortunately none for your Hollands, but I did take photos of the approximate places where the graves are, and can let you have the pics if you'd like them, I can also email you the plans showing the grave numbers. if you would like them, please send me a personal message with your email address
Barbara