PB or RR= Piggyback  or Remote Res(In front of shock part #)

36 or 46= 36 is Front Shock/ 46 is Rear (all front are in pairs)

C= Compression Adjustable(After shock part #)

R= Rebound Adjustable(After shock part #)

LT= Long Travel(After shock part #)

Example- PB36CRLT is a PiggyBack Front Shock pair with Compression and Rebound Long Travel Quadrate