Jimmays- get a better mechanic. All parts are available. Too many coach owners have believed hacks who are trying to sell an expensive fix, i.e. sell you a new drag link or re-manufacture yours to take some ball joint end they like to sell.
Here is some info I've copied off prior posts (links may not work & pricing may be a few years old; feel free to update us when you locate parts):
early models w/1.5” diameter drag link tube:ordered from Truck Components Online. Part numbers are…310-223 TIE ROD END-RIGHT HAND $35; 310-222 TIE ROD END-LEFT HAND $35, aka NAPA HES 423R and HES 423L. They come with new castle nuts and cotter pins.
Later models (~2003+) w/1-13/16 diameter tube: “Dayton Part Number: 310-444 (right hand threads), The box also had a industry standard number: ES9601R” That Dayton part# cross references to Euclid E-10163, Meritor part number is: 1698846 right-hand thread @ 16tpi, per Old RV'er. The above per iRV2 thread postings. For $74: http://www.vanhorntruckparts.com/product/23799/Tie-Rod-End-E-10163/ Dayton 310-444 specs are given by http://www.truckcomponentsonline.com/TIE-ROD-ENDS.HTML
as stud-cntr-to-rod-end 4.72”, rod shank M30x1.5 thread pitch, Taper- lg diam 1.126”, sm diam 0.94”, taper length 1.1” Stud M20x1.5 which match the ZF shop drawing except for a very slight change in taper angle which should work. for tie-rod ends: 310-433 & 310-434 available from TruckComponentsOnline.com
for about $45 + applicable tx & shipping.These are Lt & Rt hand thread w/1.125" threaded section. In searching, I found cross references as follows: 310-433, ES2090L, 230072 for the Lt hand threaded joint 310-434, ES2091R, R230073 for the Rt hand