A 17" riser w/ long limbs makes a 62" bow, 19" w/ longs makes a 64".
Except for some of the TradTech limbs which are measureed on 17 or 19 inch risers, all other ILF limbs are measured on a 25".
The TradTech Black Max and Black Max Carbon and BF Extreme limbs are measured on 17" risers. The TradTech woodgrain recurve and longbow limbs are measured on a 19" riser IIRC.
As a rule of thumb add 1# to draw weight for every inch shorter the riser is than marked, example 40#/25" riser is 50#/15" riser.