Been watching the automotive parts sector lately and there's actually an interesting setup forming here. While the industry faces real headwinds from tech complexity and supply chain pressure, there's this countertrend nobody's really talking about - the aging US vehicle fleet is creating serious tailwinds for spare parts stocks right now.

Here's what's happening: people are sitting on older cars longer because new vehicle prices are still brutal. Average car age hit 12.8 years last year, which means more maintenance spending, more replacement parts demand. That's a pretty solid structural support for the right players in this space.

The challenge is most of these spare parts stocks have been beaten down - the industry's down nearly 20% over the past year while the broader market gained 15%. Part of that is justified (earnings estimates came down, tech transition is real), but some of this looks like overshooting to me.

If you're looking at replacement parts stocks worth watching, I'd flag three names that seem positioned better than peers:

Dorman Products (DORM) - They expanded their Light Duty lineup significantly in 2025, unlocking millions in new sales opportunities. What caught my attention is they raised their full-year sales guidance to 7-9% growth. They've beaten earnings estimates consistently. The consensus for 2025 earnings shows 18% growth year-over-year.

Standard Motor Products (SMP) - Acquired Nissens back in late 2024, which expanded their global footprint in engine management and temp control systems. The integration's tracking well with expected $8-12M in annual cost savings. Sales and earnings guidance for 2025 implies roughly 20% and 17% growth respectively.

Douglas Dynamics (PLOW) - Their Solutions segment had a monster Q2 2025, with EBITDA up nearly 40%. Strong backlog and margin expansion continuing. They raised their 2025 sales guidance to $630-660M range. Earnings growth estimate for the year is sitting at 46.9%.

Valuation-wise, the sector trades at 6.89X EV/EBITDA versus the S&P at 17.81X, so there's definitely some pricing in of the negativity. Whether these spare parts stocks can actually deliver on growth depends on execution and whether that aging fleet demand stays as solid as it looks. Worth keeping on your radar if you're hunting for overlooked value plays in industrials.