Replacement Roller Shade Springs for 2019 Thor Miramar RV

The 2019 Thor Miramar 37.1 model name does not establish the roller-tube diameter or replacement spring. First identify the shade maker, product line and original mechanism. A shade installed or replaced in that coach may differ from another window or from the original equipment; the coach year alone is not a spring cross-reference.

The current Irvine 1¼-inch Slow-Rise spring listing is specified for 2019-and-newer premium shade systems. Its 1¼-inch designation refers to the roller tube outside diameter, not the fabric roll, inside bore, mounting rail or spring length. If the shade is positively identified as the applicable Irvine system, measure the exposed metal tube across its outside edges without forcing or dismantling a tensioned mechanism. A bracket or end-cap measurement is not a substitute.

Tube diameter is only one check. Record the shade width and compare the original spring assembly's length, end fittings and revision. Irvine's replacement-parts reference separates Slow-Rise spring sizes by shade width; the current listing offers RS-SR31XS, RS-SR31S, RS-SR31SM and RS-SR31L. A 1¼-inch tube alone does not select one of those four options, establish spring failure or confirm a repair.

The original shade label, measured tube diameter and mechanism details are not provided in this question. The actual Miramar shade's diameter and exact replacement therefore remain unconfirmed; do not order the 1¼-inch option solely because the RV is a 2019 model.