Jones said both players would be out for a long period Clark injury contributed to the Riders shuffling the offensive line. Brendon LaBatte moved from left guard to centre. Bruce Campbell is the left tackle, bumping Derek Dennis to left guard. Sunday first road trip of the season to Seattle, the 49ers return home on a short week to host the Los Angeles Rams on Thursday night, Sept. 21. Three consecutive away games are next: to Arizona, Indianapolis and Washington..…