
Measured coil gap: 11/16–7/8 in
Front or rear, subject to confirmed application
View exact product and conditionCoil SumoSprings are progressive microcellular urethane inserts that sit between turns of a compatible coil spring. Unlike a replacement suspension spring, the insert works with the original spring as it compresses. Choosing the right part begins with the actual open gap between the middle coils, not a guessed vehicle-year application. This guide compares three manufacturer sizes offered by UsedRVParts.
SuperSprings International instructs customers to measure the gap in the middle of the coil spring with the vehicle resting at its normal ride height, without raising it for the measurement. Measure both sides; the manufacturer advises that the two measurements should be within ¼ inch of each other. Round the measured gap down to the nearest 1/16 inch and select the matching manufacturer range.
Measure the free space between the adjacent coils—not wire thickness or total suspension height.
| MPN | Coil gap | Decimal gap range | Application position |
|---|---|---|---|
| CSS-1094 | 11/16–7/8 in | 0.6875–0.875 in | Front or rear, subject to confirmed application |
| CSS-1168 | 1 7/16–1 5/8 in | 1.4375–1.625 in | Manufacturer lists front applications |
| CSS-1195 | 1 11/16–1 7/8 in | 1.6875–1.875 in | Front or rear, subject to confirmed application |
Coil SumoSprings use microcellular urethane to provide progressive resistance as a coil spring compresses. Properly selected inserts can help reduce loaded sag and suspension movement. They do not require an onboard air compressor, inflation valves or air hoses, and the kits listed here include two inserts.
Each card links to the matching UsedRVParts.ca listing. Confirm current condition and availability before ordering. The store carries both new and used parts; eligible used items can be viewed or collected by appointment in Kelowna.

Measured coil gap: 11/16–7/8 in
Front or rear, subject to confirmed application
View exact product and condition
Measured coil gap: 1 7/16–1 5/8 in
Manufacturer lists front applications
View exact product and condition
Measured coil gap: 1 11/16–1 7/8 in
Front or rear, subject to confirmed application
View exact product and conditionCoil inserts are not the same as frame-mounted rubber helper springs, replacement coil springs or air-spring assemblies. Choose based on the suspension design and exact application, rather than treating them as interchangeable.
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