OK, thanks, I think I will get the FT head and just shim the springs to match the 8005a springs. The inch rate of the 8005a's is 10lbs more and it has 135lbs @ 1.875 vs the TF springs of 120 @ 1.900 installed height. I would think the TF springs would be around 130lbs @ 1.875.
Can anyone tell me the inner and outer size of a shim that will work.