EMT electricians pipe has a few sizes that work well.
Mine was not an 83-85 200X but I just made my own intake flat plate (I used .1875 or 3/16ths) and then welded the correct length to it to make it fit. Use yellow/red (backhoe/heavy truck) type of hose. If you have a flat sander you can angle it up/down/left or right.....
If it's the rear, boiling it does help or a heat gun.
O course a lathe can help allot with proper sizes but I lived without one for years and had to get creative... Dremels, belt sanders etc. etc.
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country