The second link you mention is the link to which I have been directing people. More recently, I have been linking directly to their website which costs less than the eBay ad. This link is on my "Pricing" page.
As for my frame and your locally found 48" forks, go for it, but realize that the load limit will actually decrease from the current max of 2300 Lb, both due to the added weight of the forks as well as the potential distance of the load away from the root of the fork tine. I can't offer an amount of load decrease, but I would personally start at around 25%.
Then you have those longer forks sticking out there and, let me tell you, the 36" ones out in front of my little 2305 already seem to be really long. I don't know what you have for a tractor but keep that in mind.
As for my frame and your locally found 48" forks, go for it, but realize that the load limit will actually decrease from the current max of 2300 Lb, both due to the added weight of the forks as well as the potential distance of the load away from the root of the fork tine. I can't offer an amount of load decrease, but I would personally start at around 25%.
Then you have those longer forks sticking out there and, let me tell you, the 36" ones out in front of my little 2305 already seem to be really long. I don't know what you have for a tractor but keep that in mind.