If you wanted to run a 151" on a 155.. you would have to cut off the tail of the rail and the idler wheel mount and install the kit from Avid (Holz doesnt make it any more.
OR get custom rails and sell yours. The custom rails will cost about $125 more than you can sell your old rails for.
These use the stock axle but need 8" idlers.
Avid rail adapters...
https://www.avid-products.com/store/ProdDet.cfm?ProdID=104
OR get custom rails and sell yours. The custom rails will cost about $125 more than you can sell your old rails for.
These use the stock axle but need 8" idlers.
Avid rail adapters...
https://www.avid-products.com/store/ProdDet.cfm?ProdID=104