Because it's broken, you likely won't find an exact replacement. You'll probably need to find a suitable replacement from a parts supplier, auto parts store, or online retailer. You may need to piece together a replacement using individual vacuum tees and fittings.
To find a replacement, I recommend:
1. Take a picture of the broken piece: This will help you show parts suppliers what you need.
2. Check online retailers: Search for "vacuum tee," "vacuum manifold," or "vacuum switch" for Dodge Ram van 1985. Sites like eBay, Amazon, and RockAuto may have something suitable, even if it's not a direct OEM replacement.
3. Visit auto parts stores: Take your picture to local auto parts stores like AutoZone, Advance Auto Parts, or NAPA Auto Parts. Their staff can help you find a suitable replacement.
4. Consult a Dodge Ram van parts specialist: There are online forums and communities dedicated to classic Dodge vehicles. Someone there might have experienced the same issue and can advise on a solution or part number.
When searching, mentioning that it's from the HVAC (heating, ventilation, and air conditioning) system may be helpful, as it's a common location for vacuum components in the dash.