According to folks on this thread
Good afternoon. I am looking for the 3-point linkage for a L48 TLB, hoping someone has one laying around they would part with. I am located in SC but am willing to travel somewhat or pay for shipping. Thank You.
www.orangetractortalks.com
the L3961 kit will fit the L48, even though it's not listed for it. The whole kit cost about what one lower arm replacement does.
I saw your other thread; don't use aftermarket arms. There have been reports of folks making pretzels out of them. The OEM arms are much heavier, maybe 3/4" thick, due to the geometry required.
Background: My L35, and apparently your L48, came from the dealer with the 3ph parts. But, since they have to be removed to install the backhoe, it was common for the parts to get separated from the tractor. The L39, L45, and L47 didn't come with the parts; the parts were an option, kit L3961. So, that's the main reason the L35 and L48 aren't mentioned on the kit description and instructions.
Note: if you get the kit, you
may need different pins where the arms attach to the tractor. You could visit a dealer that has an L47 in stock and compare that area to your L48.
Note2: if you want more information, use the site search function for 'L3961' with and without my handle.