In the latest issue of the NAM Allaince Magazine is a detailed How To to convert your R53 to R56 Trailing Arms by Ryephile (Ryan Malcolm) MotoringSpeed has created a kit with all the OEM parts needed to effect this mod.

See https://www.northamericanmotoring.com/alliance to Download the Magazine

The Kit is complete with all the required MINI OEM parts. You will only need to add the Helix R56 Rear Shock Bushings. I checked with Helix and they do have plenty in stock. See http://www.helix13.com/mini/products/suspension-chasis for the Bushings.

Pricing of the Kit is $650.00 Shipped anyplace in the US.

Parts included:
1 Trailing Arm - Aluminum Left 33-32-6-765-377
1 Trailing Arm - Aluminum Right 33-32-6-765-378
2 Self tapping Screw M14x1.5x101 33-32-6-770-089
2 Bushing Stopper 33-31-6-761-779
1 Bushing Bracket Left 33-30-6-772-665
1 Bushing Bracket Right 33-30-6-772-666
2 Hex Bolt with Washer M12x1.5x83-10.9 33-30-6-768-048
2 Self Locking Collar Nut M12x1.5-10ZNS3 33-32-6-760-374
2 Hex Bolt with Washer M12x1.5x100 33-30-6-772-658
2 Adjusting Plate 33-32-6-767-869
2 Cage Nut M12x1.5-10ZNS3 33-30-6-770-138
8 Hex Bolt with Washer M10x75-10.9 33-50-6-771-928
2 Rotational Speed Sensor Rear axle 34-52-6-773-020

Please Note the Helix R56 Rear Shock Bushings are not included in the $650 price.

Wondering where to have this installed??

I've contacted some shops arouond the country and arranged the following:

Danny at MiniCorsa will do the install for $250 incl an alignment for those of you in SoCal.

Steve at Custom MINI Shop will do the install for $280.