For the 17k Level Best jack replacements we have the part # LC359275 that you referenced. For 10k legs you'd instead want the part # LC359278. view full answer...
I attached an install video to this page for a Solera slide topper for you to check out. To pick out the correct size you would need to measure the width of your slide out including the flange and then check out the other page I attached where you will then select your awning flange width to see the correct fitting options. view full answer...