TSC sells top links of various lengths. On the Farmall C, I had to make a custom length top link due to the PTO housing. I bought one from TSC, cut 5" out of the middle, set it up in an angle iron v-block and TIG welded it back together...works awesome.
They sell one that extends way out there. Also be aware that if you use a brush cutter or other PTO driven attachment with your quick hitch, the PTO shaft has to extend out another 3"-5" as well. Make sure you have enough insertion distance so the driveline doesn't come apart.
By the way, Fast Hitch was Farmall's answer to Harry Ferguson's 3 point hitch. It's actually superior to the 3-point but due to dropping the marketing ball, it never caught on. An additional factor was that Henry Ford sold so darn many tractors with the Ferguson System that the implement makers stopped making Fast Hitch equipment due to sales volume dropping. It's all a very interesting story, but I digress.