Quarq Elsa RS (Shimano rings) Crank arm questions

[r_mutt]

i have a Quarq Elsa RS BB30 and I want to swap out the cranks to shorter ones. i have set of cranks from a Quarq Riken, but the mount from the cranks to the spider seems to be different. my Riken (http://67.23.2.82/i/1200px-Quarq-RIKEN-10R-130-BB30-Back.jpg) has 3 allen bolts that attach the drive side arm to the spider while the the Elsa RS (http://d4nuk0dd6nrma.cloudfront.net/content/uploads/2014/11/Quark_Elsa-9.jpg) has 8 smaller Torx bolts. i thought perhaps it was the difference between a Riken and and Elsa, but then i found this pic on the Quarq site of a Elsa R (standard 130 BCD) (https://www.quarq.com/media/i/products/ELSA130-1652_1200x800_1.jpg)

i poked around the SRAM site and can't seem find this crank arm anywhere. every S900 or Force 22 has a 3 bolt allen mount.

does anyone know what crank arms will fit the Elsa RS? Quarq will sell me arms, but at double the price of a SRAM labeled set. surely, SRAM didn't make this arm exclusively for the Elsa RS.

[shovelhd]

Don't be so sure. Some power meter cranks are proprietary.

[Joachim]

Too bad you don't need ELSA R arms. I have an extra set of ELSA BB30 arms :).

[kramnnim]

Never seen any arms like the Elsa RS, the multitude of Torx bolts looks funny.

[r_mutt]

Too bad you don't need ELSA R arms. I have an extra set of ELSA BB30 arms :).

so you have the 3 bolt version? i am at my wit's end trying to find a SRAM crank that fits. i may have to bite the bullet and buy a set from Quarq or sell it.