Directly from Fox's application guide.
HOW TO MEASURE EXTENDED, COLLAPSED, & TRAVEL LENGTHS
NOTE: BE SURE TO TAKE INTO CONSIDERATION PIVOT ANGLES OF CV AXLES, DRIVESHAFT, SUSPENSION, AND STEERING COMPONENTS ON BOTH
EXTENDED AND COLLAPSED SUSPENSION CYCLES. A LIMIT STRAP AND BUMP STOPS SHOULD BE USED TO LIMIT THE SUSPENSION TRAVEL, NOT
THE SHOCK.
STEP 1 (MEASUREMENTS)
EXTENDED (EXT) – SECURE THE FRAME WITH JACK STANDS OR LIFT. REMOVE SHOCKS AND SPRINGS FROM VEHICLE ALLOWING THE SUSPENSION
COMPONENTS TO DROP DOWN. ONCE THE DESIRED EXTENDED LENGTH OF THE SUSPENSION TRAVEL IS SET, MEASURE FROM THE CENTER OF
THE TOP AND BOTTOM SHOCK MOUNTING POINTS. THIS MEASUREMENT IS YOUR EXTENDED TRAVEL LENGTH.
COLLAPSED (COL) – SECURE THE FRAME WITH JACK STANDS OR LIFT. REMOVE SHOCKS AND SPRINGS FROM VEHICLE. USING A JACK TO COMPRESS
THE SUSPENSION TRAVEL TO FULL BOTTOM OUT INCLUDING THE BUMP STOP. MEASURE FROM THE CENTER OF THE TOP AND BOTTOM
SHOCK EYELET MOUNTING POINTS. THIS MEASUREMENT IS YOUR COLLAPSED TRAVEL LENGTH.
STEP 2 (TRAVEL)
DETERMINE YOUR REQUIRED SHOCK TRAVEL BY SUBTRACTING THE COLLAPSED LENGTH FROM THE EXTENDED LENGTH. THIS MEASUREMENT IS
YOUR TRAVEL LENGTH.
STEP 3 (SELECTING PRODUCT)
USE THE TRAVEL LENGTH TO BEGIN TO NARROW DOWN THE REQUIRED SHOCK FOR THE VEHICLE.
LIMIT STRAP LENGTH SHOULD BE CHANGED TO ACHIEVE THE REQUIRED EXTENDED LENGTH OF THE SELECTED SHOCK.
OPTIONAL SHAFT EYELETS CAN BE PURCHASED TO SLIGHTLY INCREASE OR DECREASE SHOCKS EXTENDED AND COLLAPSED LENGTHS.
Let me know the numbers and I can look up the Fox PNs for you