wOW! I'll be d@mned if that isn't the match you need . . . How'd you figure that one out? and what's your initial platform for the conversion?
The Road Apples Mack DM kits were trash. Air bubbles are everywhere. Lineside took over the line and used vaccum casting which really improved the quality of the models. One problem area in the mold was the grill, which is partially filled in.
I took a look through my parts box and found an old MDC FMC box. The doors looked about right. I used the doors on two conviersions (one seen above) and now am working on my third, but can not find the shell I was using for parts.
On a related note, Kato C30-7 dynamic brake radiator screens work well for conventional mack grills. I am trying to fit a part into the nose of a Magnuson DM600 series with the fiberglass hood.