Charlie,
If you are already set up with the stock Frigiking system, you can simply get the interface bracket for a rotary compressor. I'd suggest the Sanden 508. You should change the hoses as well. The newer barrier hoses use an o-ring type fitting which holds up much better to the higher R134A pressures. You'll need a new reciever/dryer with hi-low cutout switch. A parallel flow, high efficiency condensor will round this all out. The interface bracket can be used to attach your new rotary compressor directly to the std, stock compressor bracket. Let me know if you need additional help--I've got the "tee shirt" for this job but opted for the Bud's type bracket since I've got a 230Sl which is set up a little different as far a belting goes! See the following e-bay URL
<http://cgi.ebay.com/ebaymotors/Sanden-conversion-bracket_W0QQcmdZViewItemQQcategoryZ33543QQihZ019QQitemZ8042161962>
George Des
