John Barclay captains the Scarlets in the huge clash as Ken Owens makes way in the starting line-up for Emyr Phillips.
Gareth Owen, Michael Tagicakibau and Aaron Shingler make a return from injury with Gareth Davies back for his first start over the season after a successful Rugby World Cup campaign.
Newcomers Maselino Paulino and Michael Collins are named on the replacements bench hoping to make an impact on their debuts.
Scarlets head coach Wayne Pivac said: "We've won the first six and we're happy with where we're sitting in the Pro12 table. It's very early days but success breeds success and the confidence is growing with each victory
"We're building a good camaraderie within the group. Don't underestimate a team that is working well together and enjoying each others company and how that transforms into a good team performance.
"We'll be going out there trying to give it our best shot."
Scarlets team to take on Leinster, Friday 6th November kick-off 7.35pm, at the RDS:
15 Aled Thomas, 14 Tom Williams, 13 Gareth Owen, 12 Hadleigh Parkes, 11 Michael Tagicakibau, 10 Dan Jones, 9 Gareth Davies, 1 Rob Evans, 2 Emyr Phillips, 3 Peter Edwards, 4 Jake Ball, 5 Lewis Rawlins, 6 Aaron Shingler, 7 James Davies, 8 John Barclay [c]
Replacements: Ken Owens, Dylan Evans, Will Taylor, Tom Price, Maselino Paulino, Aled Davies, Michael Collins, Harry Robinson
Players unavailable for selection: Morgan Allen (bicep), Will Boyde (knee/foot), Steff Evans (elbow), Steff Hughes (knee), Rhodri Jones (pec), Josh Macleod (ankle), Jack Payne (ankle), Rory Pitman (bicep), Steven Shingler (toe), Liam Williams (foot), Scott Williams (knee), Samson Lee, DTH van der Merwe, Rhodri Williams (all rested)
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