Help, need old a/c shroud replaced

Went to a RV dealer today who has a parts shop and the guy had at least 20 used ones that I saw and also new ones. I did not have a model number on the a/c unit, my helper did not find one; I will have to climb up myself and see if I can find one. The RV guy said it might have been on a plate which has fallen off, seeing as how the trailer is 40 years old. He said only way he could match it was to see the old one. All I had was the biggest piece left after it shattered and he thinks it's an old Dometic. The only shroud he had that they thought might have a chance to work was $200. And it has a rounded front and mine seems like it might be more square. So, I don't even know if it would work, period. But spending $200 on this for this old trailer seems a stretch. I'd rather just make a shroud out of something. The RV guy said the a/c wouldn't work too well if you don't have a shroud, I guess meaning it won't draw air properly or something. My takeaway after the visit was an exact match might be impossible.