Not that it's any comfort to you, but I bought my new axles from Trailer Parts Outlet in Madisonville, TX. They were the cheapest "online custom axle" sales outlet that I could find. There may be places that sell cheaper, but freight was a "killer" with them. TPO pricing is "freight included". They shipped mine FedEx freight and I picked the pallet up at the local FedEx center.
I don't have AlKo axles, mine are Lippert 5200 pound ones that just aren't holding up well, so I'm changing them out for Dexter 6000 pound axles.
I'm not associated with that business and have no relationship with them other than being a customer.
Here's the 5200 pound axle kit similar to the 6000 pound kit that I bought from them:
https://thetrailerpartsoutlet.com/co...10-4k-capacity
You'll need to measure your spring hangers and hub face to order the correct "custom axles" for your trailer. Or, if you don't want to change them out, you could find a trailer repair center or RV dealership in your area. I found that no RV dealership had "time or desire" to do the work. They all found reasons why they couldn't get the parts.... To me, seemed strange that I could order them but they couldn't LOL
Anyway, when I went to a trailer repair center, their quoted price was almost double what I could buy the parts, then they wanted that much again for labor. So the $1500 axles would have cost almost $5000 to install...
Mine are sitting in front of the fifth wheel in the pole barn and when it warms up, I'll drag it over to the house where all my tools are and change them out on a "nice day to be outside"....
ADDED: I forgot to mention that the above kits do not come with bronze bushings (wet bolts), they have plastic shims in the springs, so if you do order a kit from nearly anywhere, you'll also need a wet bolt kit if you're changing the springs.