Ahh yes, maybe so. The topic sounds familiar...
I was just scrolling through some Ebay junk and when I came across it, I had a vague recollection that somebody was looking for one previously. You're probably right though...it might have been the rubber boot...they are getting REALLY hard to find for any year.
1994 F150 4x2 Flareside. 5.0 w/MAF, 4R70W, stock.
1984 F150 4X2 Flareside. Mild 302 w/ 5spd. Sold.
1980 F150 4X4 Flareside. 300i6 w/ 5spd. Sold in 2021.
1980 F100 4X2 Flareside. 351w/2bbl w/NP435. Sold in 1995