You should consider joining the Monacoers Yahoo group, they have an extensive parts listing to buy from OEM or alternate sources.
The parts list does not specifically list a head light for a 2001 Executive, they list for a 1999 and a 2003
99 Executive Headlight assembly = 95-03 Chevy Astro Van headlight assembly or 85-03 Safari
2003/2004 Executive Headlight from a 1998 – 2004 Cadillac Seville
Got to Ebay and search for these and compare to your coach. I quickly looked at the Executive brochure for 2000 & 2001, there was a change in the headlights and it looks like yours match the 2003, which would be the Cadillac match but please check for yourself.
You will have to purchase a new AC shroud and have it painted, they come in white and black. You should have a color chart for your coach with the paint codes, you can order paint using this code and paint or take it somewhere and have it painted.
If you don't have the color codes you can contact Monaco and they will provide. Contact
Also, if you don't have the Data Card for you coach I would request, it will have all the various components listed including the AC model & SN's which may help you order parts.
If your AC units are Dometic they have a website where you can find a detailed parts breakdown for it.
This is a dealer website but it does allow you to look up parts based on model/SM. I was able to order a replacement motor for one of my AC units last year.