These restrictions are the very reason my distributor of Briggs parts no longer sell aftermarket filters and other aftermarket parts for the Briggs engines. I was looking into getting signed up as a dealer but that restriction put me off the idea. I do tend to use OEM parts as BGS there is a lot counterfeits (clones) out there that are simply no good.
I know the temptation of buying a clone carburetor is there but with my luck I had very few to work properly.
For me the counterfeits are becoming a big problem to deal with as customer that have internet access gripe about my prices for the OEM parts as see those low priced will fit counterfeits online all the time. When buying please always be aware that it seems too good to be true prices it is probably best to pass it up and save the hassles.
A good example is one of my better customer wanted go on the cheap last week on a L130 and brought a front axle rebuild kit bypassing me. The spindles were so toed out that was no way to align them even if I installed the adjustable draglinks. After I tried the spindles the L130 had nearly 3 inches of toe out. He decided to live with the worn spindles but he had close to 1" toe out with non-adjustable draglinks. I did manage make the draglinks work and had nearly zero out when mower left the shop which save him the $100 the adjustable draglinks would have cost. Toe out is a common problem on the Husqvarna mowers but this is the first time I seen it on a JD. What I learned doing the L130 can be applied to Husqvarna mowers with double draglinks so there will be a lot of them leaving the shop with straighten out front ends.
He is stuck with a product that he nor I can use. He wanted to buy the kit off him but I can't without knowing what it actually fit.