For you guys that have internal slaves, I highly recommend going with OEM on this particular part. The aftermarket clutch hydraulics are typically sourced out of China and the quality is very suspect. There are on-line dealerships that quote prices around 33% less than your local dealership, so you can use this quote to see if they will price match. If not, then order from the on-line dealership. The cost will still be significantly more than aftermarket, but when dealing with an internal slave, it is money well spent. For example, I recently went through two clutch masters. One from Schuck's which lasted 18months before leaking internally past the piston making for hard shifts. The second from NAPA lasted two whole weeks. That one was made with a metal bore and suffered a catastrophic failure. The push rod actually went through the piston. Total and immediate loss of hydraulic pressure. All pressure escaped through the reservoir check valve and blew through the vent in the reservoir cap. What a mess. Fortunately I was preparing to back out of the garage at the time it happened. Both of these aftermarket parts were made in China. My OEM replacement was made in the USA. I definitely won't be buying any aftermarket brake masters from anyone for this reason. Yes, the aftermarket parts are warrantied, but they don't cover tow charges or my time that is required to fix what never should have broke to begin with. Let alone the cost involved should the failure cause an accident.